Today a mandatory system update has been released for the XBox 360 console over XBox Live.
Users signing in to XBox Live will receive a prompt to update their systems, and users that are already signed in may be signed out and asked to accept the update.
To quote from Microsoft's Major Nelson (linked above): "I wanted to let you know that the team has released a system update for the Xbox 360 over Xbox LIVE.
Sometime over the next few hours when you sign in to Xbox LIVE you'll receive a prompt to accept this mandatory update. If you are signed into LIVE already, you may be signed out and asked to accept the update and you'll be back online in a few moments.
There are no new features or changes in this update. This update is preparation for additional system enhancements (Facebook/Twitter/Last.FM) that will arrive later this year."
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