In an interview with the LA Times’s Hero Complex blog, Stewart does admit that he will be back alongside franchise co-star and fellow British thespian Ian McKellen.
I’m very happy to report that Bryan Singer is coming back to direct the movie. I’m very happy that my lovely friend Ian McKellen is going to be with me. I don’t know anyone else who is to be involved in the project. Maybe it’s just the two of us! That would be a movie! Magneto and Xavier’s conversations…. I’m not being cute. That’s all I know. Maybe once the holidays are over, more information will begin to come through. I have a vague idea of the time commitments, but I don’t know where we’re going to shoot. But I’m greatly looking forward to it.
I don’t know about anyone else, but I would gladly watch a two-hour movie of Magneto and Xavier conversing, especially if played by McKellen and Stewart. The characters have richly developed backgrounds and if properly written it could explore some of the thematic depths that the films have already touched upon in a new and interesting way. Think of it as the superhero version of My Dinner With Andre.
Days of Future Past shoots later next year and is currently scheduled for a 2014 release. In the meantime, the next X-Men franchise installment, The Wolverine, is heading to theaters next summer.