While ‘X-Men: Days of Future Past’ doesn’t come out until May, director Bryan Singer has already begun teasing fans with details on the much anticipated film’s planned follow-up, ‘X-Men: Apocalypse,’ which is tentatively set for release in 2016. First, there was the cryptic announcement tweet in early December. Then, Singer tweeted a photo of a work session with ”X-Men: Days of Future Past” writer Simon Kinberg and ‘X2′ scribes Dan Harris and Michael Dougherty.

Asked by EW if he will direct ‘X-Men: Apocalypse,’ Bryan Singer replied,“I’m 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.” Given that this summer’s ‘The Wolverine’ introduced the plot for ‘X-Men: Days of Future Past’ in its final moments, Singer reveals he’s still not sure whether ‘X-Men: Days of Future Past’ will feature an ‘X-Men: Apocalypse’ tease. “I’m still deciding that. Something that happens in this movie causes what’s going to happen in that movie.”

The director didn’t give up specific plot points to the outlet, but he did reveal some themes. “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.” This all makes sense given that the character Apocalypse is basically the first mutant in X-Men lore.

The character Apocalypse, created by Louise and Walter Simonson, made his debut in X-Factor #6. The world’s first mutant, En Sabah Nur was born in Egypt around 3,000 BC and used advanced technology to make himself an eternal conqueror, believing wholeheartedly in survival of the fittest. I’m sure we’ll be hearing a lot more about this film as we near the May 23rd release date of ‘X-Men: Days of Future Past.’

Acting as a sequel to both ‘X-Men: The Last Stand’ and ‘X-Men: First Class,’ ‘X-Men: Days of Future Past’ includes cast members from both: Hugh Jackman, Patrick Stewart, Ian McKellen, Halle Berry, Anna Paquin, Shawn Ashmore, Ellen Page, and Daniel Cudmore return from ‘X-Men: The Last Stand,’ while James McAvoy, Fassbender, Jennifer Lawrence, Nicholas Hoult and Lucas Till return from ‘X-Men: First Class.’

Peter Dinklage, Omar Sy, Booboo Stewart, Fan Bingbing, Adan Canto, Evan Peters and Josh Helman round out the film’s principal cast. Co-written, produced and directed by Bryan Singer, ‘X-Men: Days of Future Past’ is based on the 1981 Uncanny X-Men storyline “Days of Future Past” by Chris Claremont and John Byrne.

Bryan Singer launched the’ X-Men’ movie franchise with the first two films, ‘X-Men’ and ‘X2,’ and has been a guiding influence in each subsequent X-Men film by producing. Matthew Vaughn, director of ‘X-Men: First Class,’ will produce ‘X-Men: Days of Future Past’ with his fellow co-writer on the film, Simon Kinberg, and Lauren Shuler Donner. The screenplay is written by Kinberg, Vaughn, and Jane Goldman, with Singer writing the story. ‘X-Men: Days of Future Past’ will be based on a classic comic book story arc that unfolded in two issues of Marvel Comics’ ‘Uncanny X-Men’ in 1981, from writer Chris Claremont and artists John Byrne and Terry Austin.