Xbox Live's Major Nelson has announced that there will be a mandatory system update hitting Xbox consoles later on today, or tomorrow for you guys behind GMT-0 (London).
Major Nelson revealed that there are no new features to be shown once your system is updated. The update is simply in "preparation for additional system enhancements coming to Xbox 360 later this year".
One thing I couldn't help but notice with this upcoming update is the fact that there is a possibility anyone signed into LIVE already, "may be signed out and asked to accept the update and you’ll be back online in a few moments."
So be prepared for the, sometimes dreaded, 'Disconnected from Xbox Live' notification if you're online during the day today/tomorrow.