There is more information on it, but check the December Issue of EGM to find out more, I will also type out the information regarding this.
"The movie isn't the only Halo-related endeavor for this big-time Hollywood director. Bungie and Jackson's new studio, Wingnut Interactive are working together on another entry in the series, "will be it a sequel? A prequel? A side story? We won't squeal," said Bungie Community Manager Frank O' Connor on the developer's website. "But we can tell you it will be a blend of gameplay and storytelling quite unlike anything the games industry has ever
seen before." Hmm, a blend of gameplay and storytelling--hasn't that kind of wording become like the kiss of death in this biz? Anyway, we're also hearing that this collaboration may be connected to the oft-rumored massively multiplayer Halo game."
Plus the flood will appear in it in the summer of 2008.