You've got to love it when developers use text speak in their game titles. 
Seems to me like it wasn't just for the hell of it, since there will be 4 players cooperating to accomplish the objectives. Hence the 4.
But yeah, this game could be pretty fun, but I was wondering if the AI "director" could also spawn Infected or just the regular zombies. The way I read it, it kinda sounded like the Infected were already there, and the incoming players take control of the pre-existing zombies. But it also left room for debate.