(Thanks to TeaJunkie for the tip & photo.)
*UPDATE*
Users who had gotten 15572 are reporting that they’re being prompted for 15574 as well. So it looks like if you hadn’t yet gotten 15572, you’ll be going straight from 14719 (or lower) to 15574 as of today. It’s safe to assume that based on the tiny increment in version number, this update probably serves to address some minor issues introduced in last week’s update.
Two Tweets from Major Nelson (Larry Hryb) noting that further (official) info about the update is forthcoming:
1:52 PM – 20 Jun 12 “Remember that system update that we rolled out to a few of you last week? We’re rolling it out to everyone else today.”
1:58 PM – 20 Jun 12 “I’ll have a blog post up later today about the Xbox 360 system update you got (or will be getting) today.”
*UPDATE 2*
Contrary to the rumors, the update is not reverting any drives to stock (unless you’re updating from a much older kernel [< 13146 on BenQ, Samsung, and phat Lite-On, or < 13599 on Slim Lite-On 9504]).
We’ve also seen some reports of secdata/”X” value being reset and a new “P” value, but nothing confirmed.
Though not overly revealing, Major Nelson posted on his blog some further info about the 15574 update:
What’s in it, you ask? Behind the scenes foundational improvement that will not be visually noticeable, but will help enable an easy update this Fall. There is an area that some of you may notice: We’ve added voice search for Australia and New Zealand.
If you own a Datel controller, read more here about issues after the system update.