Is anyone else playing? If not it's four player co-op L4D style game with emphasis on melee set in the Warhammer universe. Instead of zombies you are fighting rats. If you are familiar with L4D, there are tank, hunter, and jockey equivalents, and then unique special enemies beyond those.
I've put about 30 hours on this game now, and I'm having a lot of fun with it. There's no versus mode, but it has it's own twist by having persistent loot (weapons, trinkets, the occasional hat), that you can add to your characters, of which there are 5 to choose from. After each game you roll for loot, and the higher difficulty you play on, the better the loot options. On top of that, you can find loot dies and other items that increase your roll odds as you progress through the levels.