I don't think this has been mentioned yet, but Halo 4 will be on two discs.
http://www.eurogamer.net/articles/2012-09-26-frank-oconnor-on-how-halo-4-gets-the-most-out-of-the-7-year-old-xbox-360
"Unlike previous Halo games, Halo 4 runs natively in 720p resolution and comes on two discs. It also looks lovely - not quite as good as some of the screenshots released by Microsoft suggest it may, but at least as good as the best-looking games on the console."