20th Century Fox Has (Ape)Shit for Brains.
And that's coming down from the Lawgiver himself (bows head). According to this write-up on io9, Fox has passed on a script called Caesar by acclaimed writer Scott Frank (Out of Sight, Minority Report, The Lookout). Reportedly it was to be a gritty, realistic remake/reboot of Conquest of the Planet of the Apes.
Now there's a fun idea! By the time they got to Conquest, number four in the original Planet of the Apes series, they had seriously gutted the budget but some very good ideas remained, especially with regard to the civil rights movement. A new, bigger budget film could explore those issues more thoroughly.
So, of course, the studio says it's "too dark" and they can't do it.
I say we send truckloads of rotten bananas to 20th Century Fox execs to let them know how we feel about this decision.