State of Decay is one of the few zombie-based games that has asserted itself as being "different" from what is currently available. The open world game has a focus on actual survival, which means scrounging for food, ammo, and taking refuge from hordes of zombies.
The game has been announced for a Xbox 360-exclusive launch in June. However, there are plans to bring the game to PC as well, but definitely not in time for the initial release.
Some may make immediate comparisons of the game to DayZ, but of course that's not available on XBLA. Regardless, State of Decay was first announced in 2011 when it was known as Class3. If you'd like to see how State of Decay stacks up then check out the trailer that was released today: