Here's what he had to say, when asked if this follow-up will explore Magneto's morality.
"Because I have both Ian McKellen and Michael Fassbender in the picture, you'll deal with both sides of that point of view and it really explores the relationship between Xavier and Magneto and the evolution of that relationship, where it came from and where it's going."
The director also spoke about how this movie will be much larger in scope than his past X-Men movies.
"I have a certain style, when it comes to X-Men films. This one will be on a much larger canvas. It takes place during multiple times, it has an enormous cast, and there are other technologies and some science fiction aspects we haven't seen in X-Men films. I'll probably bring my old-school tone."
In related news, James McAvoy, who returns as Professor Xavier, was asked if he will be going bald in this superhero sequel. Here's the response he gave.
"I don't know yet, to be honest with you. I'm going to find out soon. There is going to be a film, where Charles goes through a lot of heavy stuff, and I think he passes through the crucible in this movie."
X-Men: Days of Future Past was released May 23rd, 2014 and stars Hugh Jackman, James McAvoy, Michael Fassbender, Jennifer Lawrence, Halle Berry, Nicholas Hoult, Anna Paquin, Ellen Page. The film is directed by Bryan Singer.