Also buried in that short Variety article is this tidbit:

Future vidgame iterations of "Halo," which has already generated more than $600 million in sales for its first two versions, are almost certain. If possible, Microsoft and U will synchronize a game and movie release to take advantage of cross-marketing.

Unless we're expected to believe Halo 3 (presumably for Xbox 360) won't actually be released until the console is two years old (and the PlayStation 3 more than a year old) the only conceivable synchronous movie-videogame launch would be Halo 4 with the Halo movie. I guess David Scully will get Angela Bassett for a co-star after all.