Today you should be prompted for a system update when you connect to Xbox Live.  This update is nothing more than improving some performance and stability issues.  There were no new features added.

In other update news, those who play a little Gears of War today will be prompted for an update as well when they start up the game.  Details of the Gears of War 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