Announced by the USPS on July 28th:

Winter Scenes celebrates the beauty and serenity of seasonal sights amid snowy landscapes. The 10 different photographs featured in this booklet of 20 stamps showcase the special allure of winter, with iconic scenes from the northern United States. Art director Derry Noyes designed the stamps with existing images taken by various photographers. New information will appear below the line, with the latest at the top.

Updated December 5th:
The Scott catalogue numbers for this issue are:
5532 Deer
5533 Northern cardinal
5534 trees and gold sky
5335 red barn with wreath
5536 barred owl
5537 blue jay
5538 red barn with snowy roof
5539 cottontail rabbit
5540 snowy path in woods
5541 two horses

Updated September 16th:
Here are the first-day postmarks for this issue: The Digital Color Postmark measures 2.97″ x 1.42″ The pictorial postmark measures 1.94″ x 1.19″

Updated September 10th from the Postal Bulletin:

On October 16, 2020, in Winter Park, FL, the United States Postal Service® will issue the Winter Scenes stamps (Forever® priced at the First-Class Mail® rate) in 10 designs, in a pressure-sensitive adhesive (PSA) double-sided booklet of 20 stamps (Item 683000). The stamps will go on sale nationwide October 16, 2020, and must not be sold or canceled before the first-day-of-issue.

Winter Scenes celebrates the beauty and serenity of seasonal sights amid snowy landscapes. The ten different photographs featured in this booklet of 20 stamps showcase the special allure of winter with iconic scenes from the northern part of the United States. Art director Derry Noyes designed the stamps with existing images taken by various photographers.

No automatic distribution.

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 – Winter Scenes 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 February 16, 2021.

Technical Specificiatons:

Issue: Winter Scenes Stamps
Item Number: 683000
Denomination & Type of Issue: First-Class Mail Forever
Format: Double-Sided Booklet of 20 (10 designs)
Series: N/A
Issue Date & City: October 16, 2020, Winter Park, FL 32789
Art Director: Derry Noyes, Washington, DC
Designer: Derry Noyes, Washington, DC
Modeler: Joseph Sheeran
Manufacturing Process: Offset
Printer: Ashton Potter (USA) Ltd. (APU)
Press Type: Muller A76
Stamps per Booklet: 20
Print Quantity: 400,000,000 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 Booklet Size (w x h): 5.76 x 2.38 in./146.304 x 60.452 mm
Colors: Black, Cyan, Magenta, Yellow
Plate Size: 880 stamps per revolution
Plate Numbers: “P” followed by four (4) single digits in four corners
Marginal Markings: Header: “Winter Scenes” Twenty First-Class Forever Stamps • Plate number in peel strip area • ©2020 USPS in peel strip area • Barcode • Promotional text in peel strip area