The update brings Google Now, Project Butter, and all the Jelly Bean treats -- along with some device specific fixes and enhancements
When we saw the T-Mobile Galaxy S II get it's Jelly Bean update, we knew the Skyrocket couldn't be far behind. They're essentially the exact same phone, and folks are using them interchangeably between T-Mobile and AT&T. We also figured it would be done via Kies, and sure enough, there's an update ready and pushing out to folks who connect to Samsung's desktop utility.
The update to I727UCMC1 (Android 4.1.2) has plenty of Jelly Bean goodies, like expandable notifications, Google Now, and Project Butter. It also has a few fixes specific to the Skyrocket, like the removal of Qik and MSpot, and call quality should be a bit better.
Grab you cables, fire up Kies and plug it in if you're using a Skyrocket. For more details, hit the source link, and to discuss the good and bad of this one, the forums are right here.
Source: Samsung. Thanks, Angela!