Gears of War developer Epic is in development on a "new unannounced IP", according to a recent job listing.
As spotted by French site Xboxygen, a recruitment call on its website states, "Epic Games is looking for Gameplay Programmers to join the team currently working on Gears of War 3, as well as a new unannounced IP in development."
The studio currently has no announced projects past Gears of War 3, which is due to ship for Xbox 360 on 20th September.
In recent months it has hinted at a possible return to both Gears and its Unreal franchise at some point in the future.

http://www.eurogamer.net/articles/20...unannounced-ip