Re: Plot ideas based on SPOILERS (general discussion)
I do think we will see a lot of Thor's rogue gallery, but most cameos. Especially since it was said a few days ago that the movie will be filled with Thor mythos. Karnilla appearing may be a possibility, but anyone outside of Malekith, and Kurse, POSSIBLY hela, would most likely be brief scenes, or cameos.
Which I think would be great. Cause even if he doesn't have anything to do with them, it lets us know that they DO exist in the MCU