Re: What is DOFP setting the groundwork for?
I think it should set up for Apocalypse. I would also show McKellan's Magneto with remorse realizing his mistakes. This will make young Magneto change, and him and Mystique could part was because she wants to continue the idea of Mutant superiority. She will then side with Apocalypse in the sequel. I think she has sided with him in the comics (or maybe that is just in the animated series) in the past.