Originally Posted by Great Mind(s)
There's no way past people are coming into the future unless there's a mind swap. The bulk of the movie has to take place in the FC era and that's fine.
Noone from past Is going Into future.Yes there might be a mind switch but there
will be no physical going from past to future.This story Is about going from future to Past.They might do a physical time travel to get someone from original
films Interacting with First Class cast onscreen.