Here's what he had to say, when asked if he wants to see the characters come back.
"Who wouldn't? Who wouldn't? [Laughing] That's all I can say."
While this is not exactly a confirmation, there was a report from December that Fox wanted Halle Berry (Storm) and James Marsden (Cyclops) to return. This is the first we're hearing about Famke Janssen's return.
The filmmaker also spoke about "fixing" certain elements of director Brett Ratner's 2006 adventure X-Men: The Last Stand. Here's what he had to say, when asked if the time travel elements will allow him to repair certain things.
"You mean, what you're politely saying is, "fix s**t. Is that what you're saying? That's what I'm hearing. [Laughing] There's going to be a little of that, a few things I can repair."
It isn't known when production will begin on X-Men: Days of Future Past.
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.