Wizards of the Coast does not appear to have future plans for the Greyhawk setting past the 2024 Dungeon Master's Guide. Speaking at a press event earlier this month, Dungeons & Dragons game architect Chris Perkins explained that the inclusion of Greyhawk campaign setting material in the upcoming rulebook was meant to stand on its own. "Basically, we're saying 'Hey DMs, we're giving you Greyhawk as a foundation on which you can build your own setting stuff,'" Perkins said when asked about future Greyhawk setting material. "Whether we get back to Greyhawk or not in some capacity I cannot say, but that's our intention for now. This is the sandbox, it's Greyhawk. Go off and run Greyhawk or Greyhawk-like campaigns with this if you wish. We may not come to this version of Greyhawk for a while because we DMs to own it and play with it. This is not a campaign setting where I think we need to go in and start defining large sections of the world and adding more weight of content that DMs have to sit through in order to feel like they're running a proper Greyhawk campaign."
The 2024 Dungeon Master's Guide includes a campaign setting gazetteer focused on the Greyhawk setting, one of D&D's earliest campaign settings. The use of Greyhawk is intended to be an example for DMs on how to build a full-fledged campaign setting, with an overview of major conflicts and places to explore within the world. New maps of both Oerth and the city of Greyhawk are also included in the rulebook.
However, while it seems like Wizards isn't committing to future Greyhawk campaign setting material, Perkins admitted that the fans still have a say in the matter. "We're not so immutable with our plans that if the fans rose up and said 'Give us something Greyhawk,' that we would say 'No, never,'" Perkins said. "That won't happen."
Perkins also teased the appearance of more campaign settings in the future. "We absolutely will be exploring new D&D worlds and that door is always open," Perkins said.
