My guess is we're going to see Krakoa and "Moira" turning out to be some long game set up by Sinister, and that it's going to end with only certain X-men standing at the end, and having to deal with the fall out, or maybe some new forms of villains. And yeah I can see something kinda bleak, though he ended SW with a more hopeful note, so maybe we'll have the X-men return to finding a way to be better and re affirm their goal of getting humans and mutants on the same side.