Speaking at QuakeCon today, Id's John Carmack said they're hard at work on first-person shooter Doom 4 and it will be "done when it's done."
He added that Id had shut down its mobile division—previously responsible for phone-based versions of games like Doom and Wolfenstein—to free up more staff for AAA games like the next Doom.
"The Bethesda family really is about swinging for the fences," he said. "I hope that we do get back to mobile in various ways in the future, but the real aim is blockbuster triple-A titles, and for Id that means Doom 4.
"Essentially everybody will be focused on Doom 4 as a project."