From the U.S. Postal Service announcement on October 22, 2019:

Made of Hearts is a continuation of the Postal Service tradition of creating stamps that celebrate love. The stamp features horizontal lines of red and pink hearts on a white background. Toward the center, red hearts in varying sizes replace pink hearts in a formation that creates one large red heart, the focal point of this graphic design. This stamp is just right for thank-you notes, get-well cards or any occasion when love is the perfect message. Art director Antonio Alcalá designed the stamp..

The Scott catalogue number for this issue is 5430

Additional information will be posted below the line, with the most recent at the top.

This stamp will be issued Thursday, January 23rd in Memphis, Tenn.

December 20th: Here are the first day cancels for this issue:

The DCP measures 2.63″ x 1.50″ The B&W pictorial measures 2.97″ x 1.48″

Also December 20th::

[press release]
Love Stamp is Made of Hearts

WHAT: Made of Hearts, the latest stamp in the U.S. Postal Service’s Love series, will be issued next month in time for Valentine’s Day. The Forever stamp features horizontal lines of red and pink hearts on a white background.

The first-day-of-issue event for the Made of Hearts Forever stamp is free and open to the public. News of the stamp is being shared with the hashtag #LoveStamps.

WHO: David E. Williams, chief operating officer and executive vice president, U.S. Postal Service

WHEN: Thursday, Jan. 23, 2020, at 11 a.m. CST

WHERE:
St. Jude Children’s Research Hospital
501 St Jude Pl
Memphis, TN 38105

RSVP: Dedication ceremony attendees are encouraged to RSVP at: usps.com/lovestamps.

Background: These new stamps from the U.S. Postal Service will deliver your message in style. Hearts are used to signify more than romantic or eternal love. Hearts are universally understood to symbolize devotion, affection and love.

While issued for use at Valentine’s Day, these stamps need no special holiday. This stamp is just right for thank-you notes, get well cards or any occasion when love is the perfect message.

December 19th: from the Postal Bulletin

On January 23, 2020, in Memphis, TN, the United States Postal Service will issue the Made of Hearts stamp (Forever priced at the First-Class Mail rate) in one design, in a pressure-sensitive adhesive pane of 20 stamps (Item 572400). The stamp will go on sale nationwide January 23, 2020, and must not be sold or canceled before the first-day-of-issue.

Made of Hearts is a continuation of the United States Postal Service tradition of creating stamps that celebrate love. The stamp art features horizontal lines of red and pink hearts on a white background. Toward the center, red hearts in varying sizes replace pink hearts in a formation that creates one large red heart, the focal point of this graphic design. This stamp is just right for thank you notes, get well cards, or any occasion when love is the perfect message. Antonio Alcalá designed the stamp and was art director for this project.

Availability to Post Offices: Item 572400, Made of Hearts (Forever Priced at the First-Class Mail Rate) Pane of 20 Stamps: Stamp Fulfillment Services will make an automatic push distribution to Post Offices of a quantity to cover approximately 30 days of sales.

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 – Made of Hearts 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 May 23, 2020.

Technical Specifications:

Issue: Made of Hearts Stamp
Item Number: 572400
Denomination & Type of Issue: First-Class Mail Forever
Format: Pane of 20 (1 design)
Series: Love
Issue Date & City: January 23, 2020, Memphis, TN 38105
Art Director: Antonio Alcalá, Alexandria, VA
Designer: Antonio Alcalá, Alexandria, VA
Typographer: Antonio Alcalá, Alexandria, VA
Artist: Antonio Alcalá, Alexandria, VA
Modeler: Joseph Sheeran
Manufacturing Process: Offset, Microprint
Printer: Ashton Potter (USA) Ltd. (APU)
Press Type: Muller A76
Stamps per Booklet: 20
Print Quantity: 200,000,000 stamps
Paper Type: Nonphosphored Type III, Block Tag
Adhesive Type: Pressure-sensitive
Processed at: Ashton Potter (USA) Ltd. (APU)
Stamp Orientation: Vertical
Image Area (w x h): 0.77 x 1.05 in./19.558 x 26.67 mm
Stamp Size (w x h): 0.91 x 1.19 in./23.114 x 30.226 mm
Full Pane Size (w x h): 5.55 x 5.76 in./140.97 x 146.304 mm
Press Sheet Size (w x h): 22.2 x 11.52 in./ 563.88 x 292.608 mm
Colors: PMS 2035 C Red, PMS 671 Pink C, PMS 670 Pink C, PMS Cool Gray 6 C
Plate Size: 320 stamps per revolution
Plate Numbers: “P” followed by four (4) single digits
Marginal Markings:
Front: Plate number in four corners
Back: ©2019 USPS • USPS Logo • Two barcodes (572400) • Plate position diagram (8) • Promotional text