Finally we get a look at the Gangs of Commorragh that we have only had early rumors of and a small part of this image.
This is supposed to be a board game according to early sources.
via Nick at L' Astrpate Facebook
https://www.facebook.com/LAstropateNewsERumorsDiWarhammer40000/
Gangs of Commorragh? That's all there's about it in this WD. We don't know what it is, but at least we know it's a product, not an event.