A survival based, open world, RPG zombie game created by the co-creator of World of Warcraft.
It came out today on XBLA for $20 after being in development since 2011.

I played the demo, which gives you about 2 hours or so to play the game, and from what I played, it's pretty awesome. If you know anything about the Arma 2 mod Day Z, it's pretty similar to that, except in a single player environment (though the studio hopes to add online co-op in a future patch).

You must operate a safe house (which may get overrun, forcing you to relocate) by finding and gaining the support of other survivors, scouting the environment for supplies, and fighting off zombies. The biggest difference from other zombie games like Left 4 Dead though, is that your characters aren't able to fight off huge hordes by themselves, and in fact, will have trouble in groups of more than 2 or 3 zombies.

The only real problems with the game are some clipping and framerate issues, but nothing game breaking.
I guess it's kind of hard to explain, but everyone who is able should definitely check out the demo to see if you like it, and the game is only $20.

Sounds legit. I can't run DayZ and ARMA which is unfortunate because I'm dying to play those games. This will have to do.