Not anytime soon. Project has been shelved by producers.
The movie now apparently is "dead" and will be awhile before it is actually made. It was orignally to be made by Peter Jackson (Lord of the Rings trilogy), but that is no longer the case.
Here's an article about its current status (or lack of status):
http://www.comingsoon.net/news/movienews.php?id=38084
The release of the newest video game HALO 3, might stir up some intrest though, You'll have to wait and see. It appears that one of the major problems is the budget - it would just cost too much to be made properly. I am sure it will be eventually made, but it doesnt appear to be anytime soon.
