State of Decay, a supposedly open-world zombie survival sandbox, doesn't seem very sandboxy at first. Two buddies are coming back from a camping trip only to discover the zombie apocalypse happened while they were out of range of cell phone service..
I don't know how accurate this is anymore but what I read earlier on in the development is that this is meant to be a prelude to a zombie mmo. Either way, it looks really promising.
There is a 2 year old thread but Project Zomboid is another interesting zombie game.
Are you going to do an offical review? Seems there are literally only two reviews for this game right now. IGN and OXM. Maybe everyone wanted to wait for the TLOU review frenzy to die down...
How much space does this require? I have one of those old 20GB 360s, so I'm constantly shuffling stuff around based on whether or not I can still re-download it from XBL. My copy of Hexic is still on the HD because there's no way I can re-download it.