"As I mentioned before the break we've been working on a major title update for Gears of War 2," said Rein. "This update will address bugs and exploits as well as add some new achievements related to downloadable content. We don't have an exact date for it but all indicators are it will go live within January. If that changes we'll let you know."
"We're fixing a whole bunch of online exploits. For example we've fixed the ability to wield an invisible shield, melee through some walls, gain infinite Lancer ammo and equip a shield and a two-handed weapon simultaneously plus many more.
"We're also making several small changes to improve the overall online gameplay experience. A few of the ones that might interest you are; increased penalties for quitting matches early, adding additional spawn protection against planted grenades and chainsaw attacks, and adding the ability to see the Submission flag carrier destination by using Tac/Com."
More Achievements will also become available with added content, and improvements will be made to increase the frequency of in-game Achievement progression notifications. A more detailed list of fixes and improvements will be released soon.
Find more information here.