Announced by the USPS on November 3, 2023:

This stamp release marks the 50th anniversary of Dungeons & Dragons, described by its owners as the World’s Greatest Role-playing Game, that has become a cultural phenomenon. By inviting participants to imagine themselves as wizards, warriors and other adventurers in exciting and treacherous fantasy worlds, Dungeons & Dragons opened doors to whole new universes of creativity for generations of players. The pane of 20 stamps features 10 different designs that highlight characters, creatures and encounters familiar to players of the game. Greg Breeding, an art director for USPS, designed the stamps and pane with existing illustrations.

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

Updated December 3, 2023:
Additional details about the stamps from Jim McKean of the USPS, via David Dresdner of Colorano and Foster Miller of Everywhere. Click on the thumbnails for larger versions:

A bronze dragon wearing a necklace glances down at a blue plesiosaur in an illustration that appeared in the 2023 book The Practically Complete Guide to Dragons.

The five-headed Tiamat, queen of evil dragons, appears in an illustration that appeared in the 2021 book Fizban’s Treasury of Dragons. Tiamat has been featured in D&D materials since the 1970s and was first encountered by name in the 1977 Monster Manual.

A lone figure lost in a maze, perhaps the victim of a ten-minute “maze” spell, appears in an illustration that appeared in the 2020 book Wizards and Spells: A Young Adventurer’s Guide.

A blue-robed figure casts a “magic missile” spell in artwork that appeared in the 2014 edition of the Player’s Handbook.

The archlich Acererak raises an army of the dead in an illustration that appeared on the cover of the 2014 edition of the Dungeon Master’s Guide. Acererak has appeared in D&D materials since 1978, when he debuted in the classic adventure Tomb of Horrors.

Drizzt Do’Urden, the heroic drow ranger featured in dozens of novels and numerous D&D gaming materials since 1988, stands against a wintry backdrop. Drizzt is known for breaking from an evil cult in the Underdark in favor of heroism and friendship on the surface.

A warrior with his back to the viewer fights a massive red dragon in a detail from an illustration that appeared on the box cover of the popular 1983 D&D Basic Set, often known simply as the “red box.” This illustration has since become one of the most recognizable pieces of art in the history of the game.

A character holds a pan of toxic green dragon’s blood over her head, preparing to bathe in it in the hope of gaining magical powers, in an illustration that appeared in the 2021 book Fizban’s Treasury of Dragons.

A death knight rides a nightmare, backed by an army of the undead and a sinister, flame-shrouded castle, in an illustration that appeared in the 2020 book Beasts and Behemoths: A Young Adventurer’s Guide.

A purple worm, a fearsome creature that burrows through the earth and leaves massive tunnels in its wake, rises from the ground and coils, its teeth on display, in an illustration that appeared in the 2014 edition of the Monster Manual.

On the left side of the pane, the selvage features a detail of an illustration showing a party of adventurers encountering a massive green dragon amid a gold-strewn ruin. The illustration previously appeared on the box cover of the D&D Starter Set.

Below the illustration is a photograph of a gold 20-sided die above the Dungeons & Dragons logo with its distinctive ampersand formed from a fire-breathing dragon. Below the logo is a detail of a hand-drawn map of a typical “dungeon,” a network of caverns where D&D players might encounter monsters, traps, and treasure.