While promoting the DVD & Blu-Ray release of Dawn of the Planet of the Apes star Andy Serkis reveals to MTV News that while it's not set in stone the series may be longer then just three films:
“To be honest, it’s very, very early in where we choose to drop our anchor in the next film, so it could be five years after the event. It could be the night after the events of where we left ‘Dawn,’ so it’s very difficult to know where the story is going right at this moment because it’s being written as we speak. It might be three films. It could be four. It could be five. Who knows? The journey will continue. It might not necessarily be summarized or completely fulfilled in this next one. The point being, eventually we know that we’re going to end up back at ‘The Planet of the Apes,’ but whether it’s this film or not, I don’t know.”
Dawn of the Planet of the Apes hits Blu-Ray & DVD November 24th