They are definitely changing everything. I don’t see it as a bad thing either. It looks great. However, I thought they were splitting the book. It doesn’t appear that way. It seems like the Allegiant movie will cover the Allegiant book. SO WHAT IS ASCENDANT GOING TO BE ABOUT?!
First thought/theory that came to mind: they will kill off Tris at the end of this movie. Half of the last movie will be without her, but she will suddenly appear. Something like that. I don’t know.
They’re trying to put as much action as possible in Allegiant movie since Allegiant book lacked a lot of it.