I think the fate of Dispossessed will come down to how Dawnbringers/CoS turn out. If everything Duardin has been ripped out that might be a good sign in a... weird kind of way that we'd see some kind of Khazalid Empire standalone 'tome. I don't feel like GW would bring back Grombrindal just for some BL stories (hell, even Gotrek got a model), especially since he can act where Grungni might not be able to but still be an extremely powerful model on the tabletop - but then again how long have people been waiting for Malerion?
There's also the mystery of the Gholems. They're very tied to Grungni and Soulbound mentions them living in Order cities, but we've never actually seen them. Whilst they could just be another Silent People or Grotbag Scuttlers, it's odd they threw out such specific circumstances in background lore without showing us anything about them, almost like they don't want to let slip of future model designs or something.