From the U.S. Postal Service announcement on November 17, 2020: [Note that this issue was revised. The new version is further down.]
From the USPS: With this commemorative stamp, the Postal Service recognizes the contributions of Japanese American soldiers, some 33,000 altogether, who served in the U.S. Army during World War II. The stamp, printed in the intaglio method, is based on a photograph. “Go for Broke” was the motto of the all-Japanese American 100th Infantry Battalion/442nd Regimental Combat Team and came to represent all Japanese American units formed during World War II. The stamp was designed by art director Antonio Alcalá.
Additional information will be posted below the line, with the most recent at the top.
Updated July 5th:
Here are the Scott catalogue numbers for this issue:
5593
a. Imperforate
Updated May 28th:
Here are the first-day postmarks for this issue:
The Digital Color Postmark for this issue measures 2.97″ x 1.44″ 
The pictorial postmark measures 2.72″ x 1.12″ 
The “special” postmark that non-first-day post offices may use measures 2.878″ x 0.94″
Updated May 14th:
The image that accompanied press release below confirms that the Go For Broke design has been revised: 
[press release]
Go For Broke: World War II Forever Stamp
Reverence for Japanese American Veterans
WHAT: The U.S. Postal Service will honor Japanese American veterans with the Go For Broke: Japanese Americans Soldiers of World War II commemorative stamp. Second-generation Japanese Americans, also known as nisei, formed one of the most distinguished American fighting units of World War II: the all-Japanese American 100th Infantry Battalion/442nd Regimental Combat Team, whose motto was “Go for Broke.”
The stamp was designed by Antonio Alcalá and is based on a photograph of a member of the 442nd Regimental Combat Team. The photograph was taken in 1944 at a railroad station in France.
News of the stamp is being shared with the hashtag #GoForBroke and#GoForBrokestamp
WHO: The Honorable Lee Moak, U.S. Postal Service Board of Governors
Gen. David A. Bramlett, U.S. Army (retired)
WHEN: Thursday, June 3, 2021, at 11 a.m. EDT/8 a.m. PDT
WHERE: A virtual dedication ceremony will be posted on the Postal Service’s Facebook
and Twitter pages. Please visit usps.com/goforbrokestamp for details.
BACKGROUND: The U.S. Postal Service recognizes the contributions that Japanese American soldiers made while serving in the U.S. Army during World War II.
For a time after Japan bombed Pearl Harbor, second-generation Japanese Americans were subjected to increased scrutiny and prejudice because of their heritage.
Known as nisei, these second-generation Japanese Americans were eventually able to join the war effort. The Army turned to nisei to serve as translators, interpreters and interrogators in the Pacific theater for the Military Intelligence Service. Nearly a thousand nisei men served in the 1399th Engineering Construction Battalion and more than 100 nisei women joined the Women’s Army Corp. Altogether, some 33,000 Japanese Americans served in the U.S. Army during World War II.
The Go For Broke: Japanese Americans Soldiers of World War II stamps are being issued as Forever stamps, which will always be equal in value to the current First-Class Mail 1-ounce price.
Customers may purchase stamps and other philatelic products through the Postal Store at usps.com/shopstamps, by calling 844-737-7826, by mail through USA Philatelic, or at Post Office locations nationwide.
Here is a large picture of the new version: 
Updated May 7th:
On June 3, 2021, in Los Angeles, CA, the United States Postal Service® will issue the Go for Broke: Japanese American Soldiers of WWII stamp (Forever® priced at the First-Class Mail® rate) in one design, in a pressure-sensitive adhesive (PSA) pane of 20 stamps (Item 480500). This stamp will go on sale nationwide June 3, 2021, and must not be sold or canceled before the first-day-of-issue.
With this commemorative stamp issuance, the Postal Service™ recognizes the contributions of Japanese American soldiers, some 33,000 altogether, who served in the U.S. Army during World War II. The stamp, made to resemble an engraving, was printed in the intaglio print method. The image is based on a photograph taken in 1944, in France, of a member of the 442nd Regimental Combat Team, whose motto was “Go for Broke.” The stamp was designed by art director Antonio Alcalá.
No automatic distribution.
Only the following pictorial postmark is permitted for the Go for Broke: Japanese American Soldiers of WWII stamp. The word “Station” or the abbreviation “STA” is required somewhere in the design because it will be a temporary station. Use of any image other than the following special pictorial image is prohibited.
How to Order the First-Day-of-Issue Postmark:
Customers have 120 days to obtain the first-day-of-issue postmark by mail. They may purchase new stamps at their local Post Office™ or at The Postal Store® website at usps.com/shop. They must affix the stamps to envelopes of their choice, address the envelopes (to themselves or others), and place them in a larger envelope addressed to:
FDOI – Go for Broke: Japanese American
Soldiers of WWII Stamp
USPS Stamp Fulfillment Services
8300 NE Underground Drive, Suite 300
Kansas City, MO 64144-9900
After applying the first-day-of-issue postmark, the Postal Service will return the envelopes through the mail. There is no charge for the postmark up to a quantity of 50. There is a 5-cent charge for each additional postmark over 50. All orders must be postmarked by October 3, 2021.
Technical Specifications:
Issue: Go for Broke: Japanese American Soldiers of WWII Stamp
Item Number: 480500
Denomination & Type of Issue: First-Class Mail Forever
Format: Pane of 20 (1 design)
Series: N/A
Issue Date & City: June 3, 2021, Los Angeles, CA 90052
Art Director: Antonio Alcalá
Designer: Antonio Alcalá
Artist: Antonio Alcalá
Modeler: Sandra Lane / Michelle Finn
Manufacturing Process: Intaglio, Offset
Printer: Banknote Corporation of America
Press Type: Alprinta 74 / Phoenix
Stamps per Pane: 20
Print Quantity: 20,000,000 stamps
Paper Type: Phosphor, Block Tag
Adhesive Type: Pressure-sensitive
Colors: Blue PMS 294, Red PMS 186
Stamp Orientation: Vertical
Image Area (w x h): 0.84 x 1.42 in./ 21.336 x 36.068 mm
Overall Size (w x h): 0.98 x 1.56 in./24.892 x 39.624 mm
Full Pane Size (w x h): 5.92 x 7.50 in./150.368 x 190.50 mm
Press Sheets Size (w x h): 11.84 x 22.5 in./300.736 x 571.500 mm
Plate Size: 240 stamps per revolution
Plate Number: “B” followed by two (2) single digits in two corners
Marginal Markings:
Front: Header: Go for Broke Japanese American Soldiers of World War II • Plate number in bottom two corners
Back: ©2020 USPS • USPS logo • 2 barcodes (480500) • Plate position diagram (6) • Promotional text
Updated March 17th:
This stamp will be issued June 3rd. The first day city is Los Angeles, and a virtual ceremony is planned.
From the USPS: Merging traditional artwork with modern design touches, this stamp depicts one of many stories about Raven, a figure of great significance to the Indigenous peoples of the Northwest Coast. Among the cultures of the region, Raven plays an essential role in many traditional tales, including stories about the creation of the world. Inspired by the traditional story of Raven setting free the sun, the moon and the stars, Tlingit/Athabascan artist Rico Worl depicts Raven just as he escapes from his human family and begins to transform back into his bird form. Antonio Alcalá served as art director.
From the USPS: These stamps pay tribute to heritage breeds, preindustrial farm animals that are enjoying renewed attention for their versatility, adaptability and unique genetic traits. This pane of 20 stamps includes photographs of 10 heritage breeds: the American Mammoth Jackstock donkey, the Narragansett turkey, the Cayuga duck, the San Clemente Island goat, the Mulefoot hog, the Cotton Patch goose, the American Cream draft horse, the Barbados Blackbelly sheep, the Milking Devon cow and the Wyandotte chicken. Zack Bryant designed the stamps with photographs by Aliza Eliazarov. Greg Breeding served as art director.
Just a guess: The Accocreek Post Office may not have the staff or experience to handle a first-day.
From the USPS: The Postal Service features a brush rabbit (Sylvilagus bachmani) on this beautiful new additional-ounce stamp, available on a pane of 20 or in a coil of 100. The pencil-and-watercolor illustration is from preexisting artwork by designer and illustrator Dugald Stermer. The brush rabbit is a small brownish cottontail rabbit of the U.S. West Coast and Baja California, Mexico. Art director Ethel Kessler designed the stamp.
Brush Rabbit stamp (Non-denominated Additional Ounce Rate) in one design, in a pressure-sensitive adhesive (PSA) pane of 20 stamps (Item 121100) and a PSA coil of 100 stamps (Item 740300). This stamp will go on sale nationwide January 24, 2021, and must not be sold or canceled before the first-day-of-issue.
From the USPS: In recent decades, Day of the Dead has caught on in the United States as a festive and increasingly popular celebration for all ages. These new stamps will be the first issued by the U.S. Postal Service to mark this holiday. Luis Fitch designed and illustrated the stamps. Antonio Alcalá was the art director.
From the USPS: These stamps capture many of the games Americans play for outdoor fun. A pane of 16 stamps features eight unique designs including: badminton, bocce, cornhole, croquet, flying disc, horseshoes, tetherball and a variation on pick-up baseball. Greg Breeding was the art director. Mike Ryan designed the stamps with original artwork by Mick Wiggins.
From the USPS: Four new postcard stamps celebrate the beauty and history of American barns. With differing qualities of light and color, each piece reflects one of the four seasons: a round barn surrounded by the hazy light and warm colors of fall, a gambrel-roofed barn in summer, a forebay barn in an early spring countryside, and a Western barn on a winter’s night. Ashley Walton designed the stamps with original artwork by Kim Johnson. Greg Breeding was the art director.
created digital paintings of four types of iconic barns found in the rural American landscape. With differing qualities of light and color, each piece reflects one of the four seasons:
From the USPS: The Colorado hairstreak graces the eighth nonmachinable butterfly stamp for use on irregularly sized envelopes, such as square greeting cards, invitations or announcements. The stamp art is a highly stylized, simplified image of a Colorado hairstreak (Hypaurotis crysalus). Artist Tom Engeman created the stamp art. Art director Derry Noyes designed the stamp.
rate) in one design, in a pressure-sensitive adhesive (PSA) pane of 20 stamps (Item 121200). This stamp will go on sale nationwide March 9, 2021, and must not be sold or canceled before the first-day-of-issue.
From the USPS: The new Mystery Message stamp will put your sleuthing skills to the test. Featuring bright colors and interesting shapes, the stamp design is a visual riddle spelling out a message. Each colorful square contains a letter in an interesting pattern. The patterns, though seemingly random, were carefully placed so that when put all together, the message reads, “MORE THAN MEETS THE EYE!” Art director Antonio Alcalá designed the stamp.
From the USPS: Garden Beauty celebrates America’s love of flowers and gardens with 10 new stamp designs in a booklet of 20. The stamps include a pink flowering dogwood; a rose-pink and white tulip; an allium, or ornamental onion; a pink and white Asiatic lily; a magenta dahlia; a yellow and pink American lotus; a pink moth orchid with mottled petals; a pink and white sacred lotus; an orange and yellow tulip; and a yellow moth orchid with a pink center. Art director Ethel Kessler designed the stamps with existing photographs by Allen Rokach.
5558 Pink Flowering Dogwood
The Digital Color Postmark measures 2.96″ x 1.47″ 
The pictorial postmark measures 2.59″ x 1.22″. The previously announced “killerbar” (“FIRST DAY OF ISSUE”) hand cancel is also available.
Colors: Cyan, Magenta, Yellow, Black
