Epic´s Mark Rein has told on Gears of War´s official forum what will be included in the most recent update. The update is now available from Xbox Live, and should start automatically when you insert the game and sign in. Update: Reportedly the released update was only for the Xbox 360 dashboard, so we´ll have to wait a little while for the actual update.
Fixed aspect ratio distortion when using VGA cable with 4:3 displays at resolutions higher than 640×480
Fixed voice issue with new players joining Player Match games in progress
Players can now get the Achievement for ”Dish Best Served Cold” when using Troika turret to kill RAAM
Fixed rare situation where host could loop countdown and never start match
Fixed rare situation where players could get stuck after chainsawing in multiplayer
Reduced Grenade Tag melee distance
Enabled Strict NAT check on host to prevent possible connection issues
Optimized server browser queries to return results more quickly and prevent scroll bars from hiding quality of service icons
Reduced number of possible revives in Execution to match Warzone
Removed host name from Ranked match server browser
Disabled security cameras in Ranked matches
Ranked matches now require balanced teams (3v3 or 4v4)
Increased penalty for quitting a Ranked match to -50 points
Added additional cheat detection code
Additional housekeeping updates
Mark Rein also told that this is just the first update, and is meant to fix the game´s more acute problems. More improvements and fixes are already in the making.