It's going to be called 'Dead Set' and is going to be shown on E4 in the next few months. From what I can gather, the story is that while Big Brother is going on, a zombie outbreak occurs. Leaving the housemates obvious to what is going on outside (until they get evicted anyway).
Charlie Brooker, the man behind Screenwipe and Nathan Barley, finally looks like he is going to poke fun at reality TV the way it should be done. By watching the contestants get ripped to pieces.
http://www.e4.com/deadset/