Todd Hollenshead, of id software, has told Gamespot in an interview that they will be showing something new at E3 this year.
“I expect that we’ll have some new stuff at E3 that we haven’t announced yet, along with Wolfenstein and other known projects.”
With Wolfenstein scheduled to release later this year there is a good bet that they already have something else in the works. Make sure to check back for more updates.
[Source]