This issue was announced by the USPS on December 13^th:

This stamp celebrates the life and legacy of civil rights leader and U.S. Rep. John Lewis (1940-2020) of Georgia. Devoted to equality and justice for all Americans, Lewis spent more than 30 years in Congress steadfastly defending and building on key civil rights gains that he had helped achieve in the 1960s. Even in the face of hatred and violence, as well as some 45 arrests, Lewis remained resolute in his commitment to what he liked to call “good trouble.” The stamp features a photograph of Lewis taken by Marco Grob on assignment for the Aug. 26, 2013, issue of Time magazine. The selvage showcases a photograph of Lewis taken by Steve Schapiro in 1963 outside a workshop about nonviolent protest in Clarksdale, MS. Derry Noyes served as art director for this project.

We will post additional information as we get it below the line, with the most recent information at the top.

Updated September 5^th:
The Scott catalogue number for this issue is 5801.

Updated June 22^nd:
[press advisory] [click on any of the pictures for larger versions]
Postal Service Honors Congressman John Lewis on New Forever Stamp

What: The U.S. Postal Service will commemorate the life and legacy of Congressman, John Lewis (1940-2020), a key figure in some of the most pivotal moments of the Civil Rights Movement.

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

Who: The Honorable Ronald A. Stroman, governor, U.S. Postal Service

When: Friday, July 21, 2023, at noon EDT

Where:
Morehouse College
Martin Luther King Jr. International Chapel
830 Westview Drive SW
Atlanta, GA 30314

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

Background: The stamp features a photograph of Lewis taken by Marco Grob on assignment for the Aug. 26, 2013, issue of Time magazine. Lewis’s name is at the bottom of the stamp. The words “USA” and “Forever” appear in the stamp’s top left corner. Derry Noyes, an art director for USPS, designed the stamp.

Devoted to equality and justice for all Americans, Lewis spent more than 30 years in Congress steadfastly defending and building on key civil rights gains that he helped achieve in the 1960s. Lewis was a staunch and unwavering believer in and advocate for nonviolent protests. The recipient of more than 50 honorary degrees, he was called a “saint” by Time magazine and “the conscience of the Congress,” by his colleagues.

Lewis was the face of the Nashville Student Movement, chairman of the Student Nonviolent Coordinating Committee, an original Freedom Rider, and one of the keynote speakers at the 1963 March on Washington. He served as executive director of the Voter Education Project; as associate director of ACTION, the federal volunteer agency that oversaw the Peace Corps and VISTA; and as a member of the Atlanta City Council. He was also the best-selling author of several books, including the March comic book series and the inspiring autobiography, Walking With the Wind.

Elected to represent Georgia in the U.S. House of Representatives in 1986, Lewis garnered the support needed to pass the Civil Rights Act of 1991, sponsored the legislation that created the 54-mile-long Selma-to-Montgomery National Historic Trail, and worked for more than a decade to establish the National Museum of African American History and Culture on the National Mall in Washington, D.C. He was awarded the Presidential Medal of Freedom, the nation’s highest civilian honor, by President Barack Obama.

Throughout his life, Lewis remained resolute in his commitment to what he liked to call “good trouble,” even in the face of hatred and violence.

Updated June 15^th:
From the Postal Bulletin:

On July 21, 2023, in Atlanta, GA, the United States Postal Service® will issue the John Lewis stamp (Forever® priced at the First-Class Mail® rate) in one design, in a pressure-sensitive adhesive (PSA) pane of 15 stamps (Item 483200). This stamp will go on sale nationwide July 21, 2023, and must not be sold or canceled before the first-day-of-issue.

With this stamp, the Postal Service™ celebrates the life and legacy of civil rights leader and congressman John Lewis (1940–2020). Devoted to equality and justice for all Americans, Lewis spent more than 30 years in Congress steadfastly defending and building on key civil rights gains that he had helped achieve in the 1960s. The stamp features a photograph of Lewis taken by Marco Grob on assignment for the August 26, 2013, issue of Time magazine. The selvage showcases a photograph of Lewis taken by Steve Schapiro in 1963 outside a workshop about non-violent protest in Clarksdale, MS. Art director Derry Noyes designed the stamp and selvage.

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 store.usps.com/store/home. 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 – John Lewis 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 November 21, 2023.

Technical Specifications:

Issue:-John Lewis Stamp
Item Number:-483200
Denomination & Type of Issue:-First-Class Mail Forever
Format:-Pane of 15 (1 design)
Series:-N/A
Issue Date & City:-July 21, 2023, Atlanta, GA 30304
Art Director:-Derry Noyes, Washington, DC
Designer:-Derry Noyes, Washington, DC
Existing Photo (stamp):-Marco Grob
Existing Photo (selvage):-Steve Schapiro
Modeler:-Joseph Sheeran
Manufacturing Process:-Offset, Microprint
Printer:-Ashton Potter (USA) Ltd (APU)
Press Type:-Muller A76
Stamps per Pane:-15
Print Quantity:-30,000,000 stamps
Paper Type:-Nonphosphored Type III, Block Tagged
Adhesive Type:-Pressure-sensitive
Colors:-Black, Cyan, Magenta, Yellow, Pantone 7543C
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):-6.50 x 8.45 in. / 165.10 x 214.63 mm
Press Sheets Size (w x h):-19.50 x 25.725 in. / 495.30 x 653.415 mm
Plate Size:-135 stamps per revolution
Plate Number:-“P” followed by five (5) single digits in two corners
Marginal Markings:
Front:-Header: John Lewis 1940-2020 • Plate number in bottom 2 corners
Back:-©2022 USPS • USPS logo • Two barcodes (483200) • Plate position diagram (9) • Promotional text

Here are the first-day postmarks for this issue: The Digital Color Postmark measures 2.67″ x 1.25″ The pictorial postmark measures 2.13″ x 1.22″

Updated March 14^th:
The issue date is July 21st in Atlanta, GA.