There is currently no release date. The project has stalled and is currently not moving forward (although many involved, including executive producer Peter Jackson, say it will eventually be made). Director Neill Blomkamp was attached, but has stated that the character of Master Chief does not hold water dramatically because of his faceless nature, and that the supporting characters do most of the heavy lifting.
If the film does get made, because of the time needed for post-production and visual effects, it will be at least two years from the start-date. So, if it does get back into production it will be at least 2012, if not later.
Sorry, dude, it's going to be a while.
