Here's a new plot summary for Avatar, the new James Cameron science fiction movie which comes out in December 2009:
Avatar is supposed to be a larger-than-life space epic that tells the story of a ex-Marine trapped on a alien world filled with all sorts of strange and exotic life forms. When his body is badly damaged, the marine undergoes an experiment to exist as an avatar. His mind trapped in the body of a supposedly 10-foot-tall alien and he becomes a powerful weapon of war.
Cameron is working on the movie's tie-in video game with Ubisoft now. [Gamertell]