I was talking about New Mutants: Dead Souls by Rosenberg. Moonstar won't join the team, but that doesn't mean you wouldn't see her, Sunspot, or Cannonball in the book according to Rosenberg. He might have said more about Moonstar on his Twitter, because I've know people have been asking, but I can't find anything else.
https://twitter.com/AshcanPress/stat...37445604970498