Based on what Matt Reeves tells Screen Rant, it would appear that War for the Planet of the Apes will include the idea that while the particular faction of apes that this trilogy has followed may have chosen to go in one direction, that doesn’t mean that there aren’t others out there who have evolved quite differently.
This would seem to set up the possibility of several potential future films in the series that would change things up either by shifting time or simply geography.
Nobody was quite sure what to make of the idea to create a prequel to Planet of the Apes, but the first film in the series, Rise of the Planet of the Apes in 2011 was a major hit that has now spawned a pair of sequels.