Acoording to IGN:
http://xbox360.ign.com/articles/772/772950p1.html
this is from 1up.com:
http://www.1up.com/do/newsStory?cId=3158031
personally I'd be geeked to get the game in Sept........as long as it's not gonna be like Halo 2 and I think something's wrong with my game cause it looks like im missing and entire part of the story, but instead that's
supposed to be the end