Though he was the one to announce the existence of the project, filmmaker Bryan Singer says he's not as locked in to "X-Men: Apocalypse" as you might expect.
Singer revealed to EW that he is "co-writing the story and I’m producing it. I'm negotiating to direct. We're in the process. We're trying to figure it out, schedules. My desire would be to direct it."
Asked if there will be a tease for the film attached to "Days of Future Past" he says: "I'm still deciding that. Something that happens in this movie causes what's going to happen in that movie."
The new film also allows him to touch upon something not covered in the previous X-Men films - mutation throughout history: "It will also address historical mutant-cy, meaning the deep past, mutant origins and things like that. It's something that's always intrigued me when we think about our Gods and our history and miracles and powers."