While id is currently keeping Rage at the forefront of its media presence, it looks like things are starting to accelerate for the next entry in the Doom series. Bethesda has made a note on its official blog that id is currently hiring, with "several programming positions open, as well as positions in Animation, Art, Design, IT, and Management." While the post doesn't directly specify that the company is hiring for Doom, it does point to the image at right as a clue to what the studio is "ramping up for."
Announced in 2008, the next Doom project is "not a sequel to Doom 3, but it's not a reboot either," according to id's Todd Hollenshead. It won't be called Doom 4 either. Whatever it is, we probably won't be hearing about it anytime soon.