Now, i am just Basing this on the Battlecry Studios job postings,and going by the job postings it kinds makes sense it would be Quake ,though it could be a new IP.Like i said i am just speculating.It certainly doesn,t sound like they are making an MMO.

http://jobs.zenimax.com/requisitions/view/371

Pluses
Shooter and/or action game experience
Experience in competitive multiplayer games