Well this was unexpected! Some kind of skirmish board game? I'm going to go ahead and wildly speculate that it is some kind of Nurgle infestation/Daemon incursion on a Rogue Trader's starship.
I'm sure we will get more info (on all kinds of GW fun) this weekend from Warhammer Fest.
Break Out the Laser Disco Ball!
And Keep The Gellar Fields Charged