Updated November 7th: Scott catalogue numbers:
Sc. 5243-46
5243 Peter Making Snowball
5244 Peter Sliding Down Mountain of Snow
5245 Peter Making Snow Angel
5246 Peter Leaving Footprints in Snow
5246a block of 4
5246b booklet pane of 20
Updated September 25th: First Day Ceremony Information:
Postal Service to Dedicate The Snowy Day Forever Stamps
WHAT:
First-Day-of-Issue dedication ceremony for The Snowy Day Forever Stamps that are based on a children’s book by Ezra Jack Keats. The event is free and open to the public. Please share the news using the hashtag #SnowyDayStamps.
The event is free with limited seating. A RSVP is required to usps.com/snowyday. A confirmation will be sent via email from USPS National Events before Sept. 29, to confirm admission.
WHO:
- U.S. Postal Service Government Relations and Public Policy Acting Executive Director Roderick N. Sallay
- Brooklyn Public Library President and CEO Linda E. Johnson
- Award-winning children’s and young adult author Andrea Davis Pinkney
- Ezra Jack Keats Foundation Executive Director Deborah Pope
WHEN: Wed., Oct. 4 @ 10:30 a.m.
WHERE:
Brooklyn Public Library Central Library
10 Grand Army Plaza
Brooklyn, NY 11238
BACKGROUND:
The U.S. Postal Service showcases Ezra Jack Keats’ most beloved story, The Snowy Day. Written and illustrated by the celebrated children’s author, it was one of the first prominent 20th-century picture books centered on an African-American child. Each of the four new stamps in this 20-stamp booklet features a different illustration of main character Peter exploring and playing in his neighborhood while wearing his iconic red snowsuit. The images include Peter forming a snowball; sliding down a mountain of snow; making a snow angel; and leaving footprints in the snow. Art director Antonio Alcalá of Alexandria, VA, designed the stamps. The stamps may be pre-ordered in early Sept. for delivery shortly after the Oct. 4 issuance at usps.com/shop.
Updated September 13th: Here are the first-day postmarks for this issue: 
The Digital Color Postmark measures 3″x2.232″. 
The B&W pictorial (rubber) postmark measures 2.353″ x 1.5”. 
The special postmark for use by other post offices measures 2.7” x 1.232”.
Updated September 3rd:
On October 4, 2017, in Brooklyn, NY, the U.S. Postal Service will issue The Snowy Day stamps (Forever priced at 49 cents) in four designs, in a pressure-sensitive adhesive (PSA) booklet of 20 stamps (Item 676100). The stamps will go on sale nationwide October 4, 2017.
With these stamps, the U.S. Postal Service showcases Ezra Jack Keats’ most beloved story, The Snowy Day. Written and illustrated by the celebrated children’s author, it was one of the first prominent 20th-century picture books featuring an African-American child. Each of the four new stamps in this 20-stamp booklet shows a different illustration of the main character, Peter, exploring and playing in his neighborhood while wearing his iconic red snowsuit. Art director Antonio Alcalá designed the stamps. The images include:
- Peter forming a snowball,
- Peter sliding down a mountain of snow,
- Peter making a snow angel, and
- Peter leaving footprints in the snow.
Availability to Post Offices: Item 676100, $9.80 The Snowy Day (Forever priced at 49 cents) Double-sided Booklet of 20 Stamps. Stamp Fulfillment Services will not make an automatic push distribution to Post Offices.
How to Order the First-Day-of-Issue Postmark:
Customers have 60 days to obtain the first-day-of-issue postmark by mail. They may purchase new stamps at their local Post Office, at The Postal Store website at usps.com/shop, or by calling 800-782-6724. 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:
The Snowy Day Stamps
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 December 4, 2017.
Philatelic products for this stamp issue are as follows:
- 676106 Press Sheet with Die-cut, $78.40.
- 676110 Digital Color Postmark Keepsake (set of 4), $16.95.
- 676116 First-Day Cover (set of 4), $3.72.
- 676121 Digital Color Postmark (set of 4), $6.56.
- 676130 Ceremony Program, $6.95.
Technical Specifications:
Issue: The Snowy Day Stamps
Item Number: 676100
Denomination & Type of Issue: First-Class Mail Forever
Format: Double-sided Booklet of 20 (4 designs)
Series: N/A
Issue Date & City: October 4, 2017, Brooklyn, NY 11201
Art Director: Antonio Alcalá, Alexandria, VA
Designer: Antonio Alcalá, Alexandria, VA
Typographer: Antonio Alcalá, Alexandria, VA
Artist: Ezra Jack Keats
Modeler: Joseph Sheeran
Manufacturing Process: Offset
Printer: Ashton Potter (USA) Ltd. (APU)
Printed at: Williamsville, NY
Press Type: Muller Martini A76
Stamps per Booklet: 20
Print Quantity: 400,000,000 stamps
Paper Type: Nonphosphored Type III, Overall
Adhesive Type: Pressure-sensitive
Processed at: Ashton Potter (USA) Ltd. (APU)
Stamp Orientation: Vertical
Image Area (w x h): .77 x 1.05 in/19.56 x 26.67 mm
Stamp Size (w x h): .91 x 1.19 in/23.11 x 30.23 mm
Full Booklet Size (w x h): 5.76 x 2.38 in/146.30 x 60.45 mm
Press Sheet Size (w x h): 23.165 x 4.76 in/588.39 x 120.90 mm
Colors: Black, Cyan, Magenta, Yellow
Plate Size: 880 stamps per revolution
Plate Numbers: “P” followed by four (4) single digits
Marginal Markings: Header. “THE SNOWY DAY” 20 First-Class Forever Stamps • Plate numbers in peel strip area • © 2016 • USPS Logo in peel strip area • Barcode
Updated March 13th: The USPS says these stamps will be issued October 4 in Brooklyn, NY.
From the USPS, November 22nd, 2016:
In 2017, Ezra Jack Keats’ most beloved story, “The Snowy Day,” will be showcased. Written and illustrated by the celebrated children author, it was one of the first prominent 20th-century picture books centered on an African-American child. Each of the four new stamps in this 20-stamp booklet features a different illustration of main character Peter exploring and playing in his neighborhood while wearing his iconic red snowsuit. The images include: Peter forming a snowball, Peter sliding down a mountain of snow, Peter making a snow angel, and Peter leaving footprints in the snow. Art director Antonio Alcalá designed the stamps with Ezra Jack Keat’s original art.
WHAT:
BACKGROUND:
It measures 2.90″ x 1.45″.
It measures 2.93″ x 1.38″. Here is the black-and-white pictorial: 
It measures 2.97″ x 0.48″.
On May 23, 2017, in Concord, MA, the U.S. Postal Service® will issue the Henry David Thoreau stamp (Forever® priced at 49 cents), in one design, in a pressure-sensitive adhesive (PSA) pane of 20 stamps (Item 475100). The stamp will go on sale nationwide May 23, 2017.
Format: Pane of 20 (1 design)
With his personal example of simple living, his criticism of materialism and the questions he raises about the place of the individual in society and humanity’s role in the natural world, Henry David Thoreau (1817-1862) continues to inspire readers. For 26 months, Thoreau lived in a one-room house on a lake just outside his hometown of Concord, MA, writing prolifically while farming, reading, thinking, taking long walks and observing nature around him. “Walden,” the 1854 book he wrote about his experience, still holds the attention of readers by blending elements of numerous genres to create a complex, eclectic and unique work. Art director Greg Breeding designed this stamp with original art by Sam Weber. 
On July 12, 2017, in Chadds Ford, PA, the U.S. Postal Service® will issue the Andrew Wyeth stamps (Forever® priced at 49 cents), in twelve designs, in a pressure-sensitive adhesive (PSA) pane of 12 stamps (Item 475000). The stamps will go on sale nationwide July 12, 2017.
This issuance includes 12 stamps that feature a detail of a different Andrew Wyeth painting. The paintings are: “Wind from the Sea” (1947), “Big Room” (1988), “Christina’s World” (1948), “Alvaro and Christina” (1968), “Frostbitten” (1962), “Sailor’s Valentine” (1985), “Soaring” (1942–1950), “North Light” (1984), “Spring Fed” (1967), “The Carry” (2003), “Young Bull” (1960), and “My Studio” (1974). The selvage shows a photograph of Wyeth from the 1930s. Art director Derry Noyes designed the pane.
Issue: Andrew Wyeth Stamps
Mastering a realistic style that defied artistic trends, Andrew Wyeth (1917-2009) created haunting and enigmatic paintings based largely on people and places in his life — a body of work that continues to resist easy or comfortable interpretation. Finding endless inspiration both in his hometown of Chadds Ford, PA, and in rural Maine, he scrutinized the lives, houses and personal belongings of people around him, sometimes painting their portraits but just as often using objects and places to represent them. 2017 is the centennial of Wyeth’s birth. With subtle symbolism and eerie implications, his work invites us to reinterpret his personal vision. Derry Noyes art directed and designed this pane of 12 stamps.
On June 14, 2017, in Hartford, WI, the U.S. Postal Service® will issue the Have a Ball! stamps (Forever® priced at 49 cents), in eight designs, in a pressure-sensitive adhesive (PSA) pane of 16 stamps (Item 474900). The Have a Ball! $7.84 pane of 16 stamps may not be split, and the stamps may not be sold individually. The stamps will go on sale nationwide June 14, 2017.
It measures 2.94″x1.18″.
On April 11, 2017, in Rochester, NY, the U.S. Postal Service will issue the Robert Panara two ounce rate mail use stamp (Nondenominated, priced at 70 cents) in one design, in a pressure-sensitive (PSA) pane of 20 stamps (Item 114000). The stamp will go on sale nationwide April 11, 2017.
WHAT:
BACKGROUND:
The U.S. Postal Service commemorates the 200th anniversary of Mississippi becoming the 20th state on Dec. 10, 1817. The Mississippi Statehood Forever stamp features a photograph taken by Lou Bopp in 2009. It shows a close-up of a musician’s hands as he plays his guitar. Mississippi is the birthplace of many legendary blues artists who created a uniquely American genre of music.
This stamp celebrates the 200th anniversary of Mississippi statehood. Mississippi became the 20th state on Dec. 10, 1817. The stamp features a 2009 photograph showing a close-up of a guitar player hands. Mississippi is the birthplace of many legendary blues artists who created a uniquely American genre of music. Among states, the Magnolia State is 32nd in size, and with nearly three million people, it ranks 31st in population. Art director Greg Breeding designed the stamp with an existing photo taken by Lou Bopp.
It measures 2.93″ x 1.38″. There is also a pictorial first-day postmark: 
Although it looks virtually identical, we’re told it measures 2.97″ x 1.48″.
When:
It measures 2.93″ x 1.38″.
Tuesday, May 2, 2017, 11 a.m.
Wednesday, March 1, 2017
It measures 2.95” x 1.32″. The B&W first-day cancel for this issue is the standard 4-bar “FIRST DAY OF ISSUE.” Here is the “special” postmark that local post offices may use: 
It measures 2.9” x 1.3″
On March 1, 2017, in Lincoln, NE, the U.S. Postal Service« will issue the Nebraska Statehood stamp (Forever« priced at 49 cents), in one design, in a pressure-sensitive adhesive (PSA) pane of 20 stamps (Item 474400).
This stamp celebrates the 150th anniversary of Nebraska statehood. Known for agriculture, the Cornhusker State became the 37th state on March 1, 1867. Nebraska photographer Michael Forsberg set up among prairie grasses on the riverbank between the small cities of Grand Island and Kearney to capture the image shown on the stamp. In the photograph, sandhill cranes fly low to scout for shelter from nighttime predators. This mid-migratory rest for half a million birds along the Platte River is unique to Nebraska. Forsberg captured this image as winter thawed into spring around the year 2000. Art director Derry Noyes designed the stamp using Forsberg existing photograph.
