While X-Men: Apocalypse has been announced for a May 27, 2016 release date, very little else has been actually confirmed about the film. While Singer has reportedly indicated that X-Men: Apocalypse will feature the younger cast only, it appears that some of the older X-Men cast isn't giving up hope on making it into the film.
In a video interview with BuzzFeed Brews, Ian McKellen and Patrick Stewart were asked what the chances were of them being a part of X-Men: Age of Apocalypse.
McKellen replied, “I don’t see how they can do it without us, really. Do you? I think if enough people start sending messages to Bryan Singer and Lauren Shuler Donner, then yeah.”
Patrick Stewart said, “How can anything be apocalyptic without Magneto and Xavier? It doesn’t make sense.”
McKellen, who earlier joked about not having to wear the helmet in X-Men: Days of Future Past, added, “I would even wear the helmet. I really would.”