This prequel to Planet of the Apes shows how apes evolved to take over the planet. The monkey effects look excellent.
This description of the movie is provided by TrailerAddict.com:
A single act of both compassion and arrogance leads to a war unlike any other -- and to the Rise of the Planet of the Apes. The Oscar-winning visual effects team that brought to life the worlds of Avatar and Lord of the Rings is breaking new ground, creating a CGI ape that delivers a dramatic performance of unprecedented emotion and intelligence, and epic battles on which rest the upended destinies of man and primate.
Opening on August 15, 2011, the film stars James Franco and Freida Pinto.