John Carmack interview on USA Today talking with the id Software cofounder about his relatively new role at Oculus Rift (thanks Gamasutra). Along the way he explains why he left id, saying had id owner ZeniMax and Oculus been able to work out a deal, Wolfenstein: The New Order would have been shown by Oculus at CES, and DOOM 4 would have had a leg up on headset support. Here's more:

Another outcome of an Oculus-ZeniMax deal? Carmack would not have left id in November and would have continued working at both companies. "I would have been content probably staying there working with the people and technology that I know and the work we were doing," he says.

"But they couldn't come together on that which made me really sad. It was just unfortunate," Carmack says. "When it became clear that I wasn't going to have the opportunity to do any work on VR while at id software, I decided to not renew my contract."