According to The Wall Street Journal on Dec. 17, both Patrick Stewart and Ian McKellan joined together to discuss their roles and their interaction with their younger characters in "X-Men: Days of Future Past". When asked about what they had to do to get in alignment with not only the younger versions of their own characters they have portrayed in the previous three "X-Men" movies, but also there comes a question about adjusting to becoming in sync with their own corresponding younger actors.
Stewart described that he had actually come "nose-to-nose" with McAvoy when they had first met to do a scene and ironically enough that portion of the filmed take was Stewart's last day of filming "X-Men: Days of Future Past" while this was McAvoy's first day shooting the Bryan Singer film.
However, McKellan mentioned he never did any kind of pow-wow session with Michael Fassbender as the young Magneto celebrity preferred it that way.
Also, when asked if they would be in "X-Men: Apocalypse", they seemed to really know nothing about the "X-Men" film following "X-Men: Days of Future Past". They automatically assumed if they were not privy to such an announcement then it'd probably mean they will not be in it.
Of course, Stewart fired back ,"And then they'll finally need us after all". From his tone, he made it seem like that due to the nature of show business that things can change on a whim.
Both McKellan and Stewart, as if they so suddenly put on their "acting helmets" seemed to play it as if they knew nothing about it.
"X-Men: Days of Future Past" opens on May 23, 2014.