Quote:

"We will be trying to put some other developers on the future classic titles," said Carmack. "I don't think I'm going to be doing all of the work on Quake, Quake 2 and Quake Arena on there." Added the Carmack: "I may need to go in there and make sure certain specific things are done the way I want them to be."

http://www.shacknews.com/onearticle.x/59326