John Carmack, the renowned Id developer, has revealed that he is unable to discuss the next Doom game.
A fan asked Carmack if he could discuss the progress of Doom 4 during a Q&A session at the end of this year's QuakeCon keynote.
"I can't," Carmack answered. "I actually asked about whether I could say anything related to the development, and the answer was, no, I couldn't."
Not much is known about the development of Doom 4, which was originally announced back in 2008. Since then rumours surfaced that development on the game had been halted, although Bethesda last year confirmed that this isn't the case.