I didn't even hear about this game until I saw the Gamescom trailer, but now I'm kind of excited about it.
This is one of those games where your decisions are supposed to mean something, but what I found interesting was that it isn't just gameplay that's affected. Apparently the landscape is altered as well. I'm guessing through looting houses and finding materials to build up your base, everything you do is permanent. I also like the fact that the focus is on teamwork and base-building, not just killing zombies. I'm already a sucker for any post-apocalyptic zombie game, but this one seems promising.
