I don't think we'll see much more of the last vampire in Dwarven lands, either-- I think it's too outnumbered and the Dwarves are aware of its presence now, so it's going to be hard for it to succeed at anything. I don't think anything will come of Xykon's fortress; it's exactly as Peelee said*, a false sense of security for him.
That one was also kind of weak IIRC, and didn't even have a coffin. No chance.


On the OP, I don't really consider that physical location of Kraagor's gate to be a major unresolved thread. We saw a few strips before Calder that the gate is breaking down: the Threads of Creation are showing. Not only is it in the Final Dungeon, it's probably somewhere almost directly above the bridge in front of Calder.

Also, I'm not seeing anyone talking about the resolution to the goblins needs and species inequality. That's a massive subplot to Redcloak's entire character motivation, and beyond him the Dark One.