Recently while talking with Oregon Live, Patrick Stewart confirmed that Ian McKellen will be in X-Men: Apocalypse.
Yes, I understand that it seems to be very unlikely that I will be in the next “X-Men” movie, which is almost getting ready to start shooting in Montreal, but Magneto, Ian McKellen, is certainly going to be in it.
He also said that he is in talks to appear in the next Wolverine movie along with Hugh Jackman:
And what I’m very excited about is that we have been talking about a Wolverine movie, which would team Hugh Jackman and myself together. Wolverine and Professor Xavier. That would be a very different sort of “X-Men” from the four movies that I’ve already done.