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

The Postal Service introduces Garden Corsage, a new 2-ounce stamp. This stamp can accommodate the weight of heavy invitations for birthdays, weddings, anniversaries and other celebrations, oversize greeting cards for all occasions, and mailings such as small gifts that require extra postage. The stamp features a photograph of a corsage containing a spray of peach roses and a pink ranunculus, accented with deep-pink heather and seeded eucalyptus. A cream-colored lace ribbon entwines the flowers. Garden Corsage is similar in design to the Contemporary Boutonniere Forever stamp, and the two form a natural pair. The corsage was arranged by floral designer Carol Caggiano and photographed by Renée Comet. Art director Ethel Kessler designed the stamp.

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

This stamp was issued Thursday, April 2nd, in Crestwood, Kentucky.

The Scott Catalogue number for this issue is 5458.

Updated April 16th:
Here are the first-day cancels for this issue:The Digital Color Postmark measures 2.85″ x 1.38″The pictorial postmark measures 2.64″ x 0.95″

Updated March 23rd:
The first-day ceremony for this stamp has been canceled. The stamp will still be issued on April 2nd. More details will be announced closer to the issue date.

Updated March 12th:
Technical Specifications:

Issue: Garden Corsage Stamp
Item Number: 585900
Denomination & Type of Issue: 2-Ounce Rate, Non-denominated, Mail Use
Format: Pane of 20 (1 design)
Series: N/A
Issue Date & City: April 2, 2020, Crestwood, KY 40014
Art Director: Ethel Kessler, Bethesda, MD
Designer: Ethel Kessler, Bethesda, MD
Typographer: Ethel Kessler, Bethesda, MD
Photographer Renée Comet, Washington, DC
Modeler: Joseph Sheeran
Manufacturing Process: Offset, Microprint
Printer: Ashton Potter (USA) Ltd. (APU)
Press Type: Muller A76
Stamps per Pane: 20
Print Quantity: 45,000,000 stamps
Paper Type: Nonphosphored Type III, Block Tag
Adhesive Type: Pressure-sensitive
Processed at: Ashton Potter (USA) Ltd. (APU)
Stamp Orientation: Horizontal
Image Area (w x h): 1.05 x 0.77 in./26.67 x 19.558 mm
Stamp Size (w x h): 1.19 x 0.91 in./30.226 x 23.114 mm
Full Pane Size (w x h): 5.76 x 5.55 in./146.304 x 140.97 mm
Colors: Black, Cyan, Magenta, Yellow, PMS Cool Gray 7 C
Plate Size: 320 stamps per revolution
Plate Numbers: “P” followed by five (5) single digits in four corners
Marginal Markings: Plate position diagram (8) • 2 Barcodes (585900) • ©2019 USPS • USPS logo • Promotional text