Well, spoilers be damned, now it's out there. M. Night Shyamalan just announced via Twitter that his next movie is called Glass. It's a sequel to Split and Unbreakable simultaneously, and it will be in theatres 18 January 2019.
M. Night Shyamalan's Split has been out for a little over three weeks in Australia, so odds are if you haven't seen it yet, you at least know how it ends. And if you do, you probably understand why Samuel L. Jackson's comments on it are so noteworthy.
Thank the moviegoing public because Split is a hit. That means writer/director M. Night Shyamalan is already at work on the sequel and, in a new interview, he got into a few details of what that sequel could be. Also, he revealed an alternative ending to the film.