Although Gears of War currently has the once-max 1000 gamerscore points alloted over 49 achievements, Microsoft amended the policy to allow an additional 250 points for new content. The Elder Scrolls IV: Oblivion utilized the new policy for its Shivering Isles expansion.
Rein also said that the update will tackle the "previously mentioned plan to improve roadie run" as well as more exploit squashing and the ever-popular 'general housekeeping.'" Not listed? The not-for-public-view Gears of War golf game. Come on Epic, give us Marcus Fenix putt-putt!
[Via Xbox 360 Fanboy]