Reports are flooding in that Microsoft has begun rolling out SystemUpdate version 2.0.15572.0 (Summer 2012 Production Flash). There are no immediate official details from MS regarding it yet, but an announcement from Major Nelson is likely forthcoming. The update is being deployed in waves, so if you haven’t received it yet, give it some time and you’ll eventually be prompted for it. So far, users who have updated are reporting no adverse effects (on the surface) as far as firmware-flashed 360s are concerned. The team will take a closer look and analyze whether there are any important underlying changes that affect firmware or RGH. Our usual warnings apply.
*UPDATE*
Two Tweets from Major Nelson (Larry Hryb) regarding the update:
2:01AM 13 Jun 12 “If you got an Xbox 360 System Update: Spring update rolling out to a few this week — everyone else next week.”
2:01AM 13 Jun 12 “The system update contains behind the scenes improvements & prep for future enhancements.”