I just did a quick search (wikipedia), it says you can play as 4 characters and it's 4 player co-op, and you're trying to survive a zombie attack. It sounds like like L4D, and is probably going to be a bunch of zombie killing with some leveling up, while having fun via Co-OP with your buddies.
It will probably be a good game, but it's another first person game where you kill a lot of zombies co-op with friends in a big open world.
After playing L4D, RDR zombie expansion, platns vs. zombies, dead rising 2, etc etc, zombies are just... boring.
That's what I meant by saying it'll be just another zombie game.