The Roy Lichtenstein Centennial Commemorative Stamp Set was issued on April 24, 2023 with a formal ceremony at the Whitney Museum of American Art. This has been an exciting project and a new Forever Stamp will enter the USPS inventory.
For more information please see:
U.S. Postal Service Honors Roy Lichtenstein’s Pop Art on New Forever Stamps
U.S. Postal Service Honors Roy Lichtenstein With New Forever Stamps