Also seems to be confirmed he's leaving id: http://www.engadget.com/2013/08/07/oculus-rift-john-carmack-...
Update: Bethesda Softworks (parent company to id Software) responded with the following statement to today's news: "John has long been interested in the work at Oculus VR and wishes to spend time on that project. The technical leadership he provides for games in development at id Software is unaffected." We've followed up for clarification as to what that means for Carmack's efforts at id. In the note from Oculus, Carmack is said to be heading up and working out of newly created Dallas offices for Oculus.
EDIT: He still works at Id http://www.gameranx.com/updates/id/16593/article/john-carmac...
Don't quote me on that though because a lot of those talks did go over my head.
he used to be id first, armadillo airpspace second. now he's occulus first, id second.
it'll only preclude him from doing much programming.
Another important point is that it's not games he develops, it's game engines. Other people do most of the game logic and design. Working on a 3d display for those engines doesn't seem so far removed from that, and of potential value to future id/ZeniMax work.
He has made it pretty clear over the last few years that there really isn't a lot for him to do there, at least on interesting stuff. Writing rendering engines has become more incremental than revolutionary and I get the feeling that, for him, stuff like mega texture was about as interesting as writing a new zip program.