If you've only been enjoying the online co-op horde mode in Gears of War 2, or perhaps even the two player co-op campaign mode via Xbox Live - you may never have known about all the cheats and exploits that are happening in Epic's Gears of War 2. But there are plenty to go around.
Co-op players should benefit a bit from these changes as these weapon tweaks and lag reducing fixes. And while we aren't quite sure what is available yet in the promised added achievements, we can only hope there's a few new co-op ones. Speaking of achievements, the achievement progress notifications are promised to be more frequent as well as integrated into the war journal. Nice!
Source: Gearsforums.epicgames.com