An official Samsung Jelly Bean 4.1.1 ROM for the I9300 has surfaced in an ten-minutes long video (Video Below) showing the Official Jelly Bean ROM for the Galaxy S III I9300.Samsung will announce the Jelly Bean 4.1 Update Rolling-out for S3 on the 29,August Event at the same time they will announce the Galaxy Note II.
Galaxy S III Jelly Bean Update features
Android 4.1.1 Jelly Bean
New Kernel Version 3.0.31
New version of Samsung's SVoice App
New Transitions Effect
Improved TouchWiz UI
Improved Camera App
Added Google Now support
Smoother scrolling with Jelly Bean "Project Butter"
Notification area Improved with more functionality
Enhanced Performance & Stability