Diego Luna will play Julio, the best friend of Matt Damon's character. Oddly enough, this is the most information we have so far on Matt Damon's role. Jodie Foster, Sharlto Copley, Wagner Moura, William Fichtner, and Alice Braga have already joined the cast of Elysium.
Neill Blomkamp will direct Elysium from his own original screenplay, which is rumored to be set 100 years in the future on another planet. Bill Block and Simon Kinberg are producing.
Production is scheduled to start sometime this summer.