Halo 4..

[Hawk]

kingofwale said:

Because Bungie has clearly stated they aren't interested in making another Halo game, THey want to move on to NEW games, NEW storyline.

http://www.videogamer.com/news/26-09-2007-6538.html

Thanks for the link, that answers my question. Another more recent one confirms it even, but says Bungie will remain very involved in multiple aspects of the Halo Universe.

http://www.videogamer.com/news/28-04-2008-8138.html