id's New IP?

Kikizo Games' John Carmack Q&A offers their Q&A about DOOM RPG for mobiles and other topics. In response to their question about what's next, the id Software Technical Director's brief reply seems to indicate that for the first time since Quake in 1996, their next project will not be based on one of their previous games:
We are working internally on a completely new project, but we haven't made any firm plans yet for the future of the Wolf, Doom and Quake franchises.