The world of Greyhawk is back. Sort of. Almost.
Greyhawk is the original campaign setting for Dungeons & Dragons from D&D founding father Gary Gygax. Greyhawk appeared frequently in Dungeons & Dragons up until 2008. After that point, Gygax's creation only showed up in fits and starts--but has always been there. In D&D 5th Edition (the edition that has existed on store shelves since 2014), several supplemental source books and compilation adventure books have Greyhawk sprinkled in.
Ghosts of Saltmarsh is an adventure compilation featuring Greyhawk's Saltmarsh location. Tales From the Yawning Portal is a collection that revamped The Hidden Shrine of Tamoachan and White Plume Mountain, two adventures in Greyhawk.
And Greyhawk characters have appeared on the titles of D&D 5e books. Tasha's Cauldron of Everything is headlined by Tasha, a character created by Gary Gygax for Greyhawk. Same with Mordenkainen of Mordenkainen Presents Monsters of the Multiverse. Bigby of Bigby Presents Glory of the Giants. And I know of at least one of those characters existing in the popular D&D 5e adventure Curse of Strahd.
So, Greyhawk has always been in 5e. But not to the degree it's being inserted into 2024 D&D. In the 2024 Dungeon Master's Guide, there are serveral episodic adventures that take place in Greyhawk while walking a dungeon master through the process of being a dungeon master. Greyhawk's resurgence is further solidified by having a foldout map of Greyhawk in the Dungeon Master's Guide.
While this doesn't constitute what I would consider a full "campaign setting," a huge map and a handful of adventures go a long way in that direction. It doesn't hurt that Warduke, that handsome fella with the flaming sword on the cover of the Dungeon Master's Guide, is also a character that was created to sell 1980's D&D action figures, yes, but subsequently wandered his way into Greyhawk.
I can't wait. But I'll have to. Of the 2024 core rulebooks, the Player's Handbook comes out first on September 17. Then the Dungeon Master's Guide comes out on November 11. (Followed by the Monster Manual on February 18, 2025, officially making the 2024 Monster Manual a book that doesn't come out in 2024).