According to the job listings, id Software’s next project is a new entry in a “long-running iconic action FPS”.
Interestingly enough, new job listings recent went up for a bunch of open positions at the studio on the Zenimax website, and they do give us some interesting clues about what id is working on.
Earlier this year, in celebration of Quake’s 2th anniversary, id Software and Bethesda released a remastered and expanded version of the original game, which also featured new expansions developed by Wolfenstein studio MachineGames.
That could, of course, potentially mean DOOM, but other interesting details in the listings point to something else.