http://io9.com/planet-of-the-apes-director-reveals-whats-next-for-the-1605444982
And this then becomes a generational story. A story of not only Caesar and his family, but his children and how this story continues down that path. How Caesar becomes the first, truly mythic god-like character for the apes. He's very seminal figure for the apes.
http://www.cinemablend.com/new/Charlton-Heston-Character-Show-Up-Planet-Apes-Series-66241.html
And if this is Caesar’s story, and the story of the mythic character that he becomes, then as we know in the apes timeline, Caesars begat other Caesars, and it’s a generational story. This is an epic journey toward the trajectory of that story!
It could be many movies. I think there are a lot of interesting stories that come, not only from Caesar, but from what comes after Caesar, his children, and his children’s children.