I couldn't find a thread for this. Headed up by Brad Muir (lead designer of Trenched/Iron Brigade) and based on Monster Hunter. It comes from the "Amnesia Fortnight" game development things that they do. 4 person co-op featuring 3 classes.
Stalwart: Shield based melee attacks.
Waracle: Melee ranged attack. Can shoot a spear, mace, and axe.
Beerzerker: The drunker he gets the more damage he does.
Here's a Giantbomb 1 hour stream of it. Footage starts at 23 minute mark.
As per shoptroll: If you want to play the prototype, Humble Bundle has the hook up.