Xbox LIVE Dashboard update:
On Wednesday, January 19th we will issue a mandatory dashboard update that (re) enables the ‘Boot to Disc’ option in the Xbox 360 dashboard. After you accept the update, you’ll be able to set the option to boot to the Xbox 360 dashboard OR directly to the game you have in the tray when you power up your console. This option can be found in the System Settings.
 
Xbox.com update:
Additionally, on Thursday January 20th the Xbox.com team will ship an update that contains a small update to the Gamercards. We’ve updated the Gamercard look and feel a bit and removed gamerzone from the card. Other than that, the same amount of information is on the card.