Samsung have started to roll out 4.1.2 for the S3 I9300 today for unlocked phones. It is going country by country over the next few days/weeks. All you peeps on O2 branded phones (O2U) will have to wait for O2 to approve but anyone with an open phone (BTU) should be getting it very soon..... (dial *#1234# for your CSC).
Samsung has added a ton of new features in Android 4.1.2 update for the Galaxy S III, most of the features are brought from the Galaxy Note II.
Some of the Enhancements in the new update: -Android 4.1.2 – JZO54K -Multi-View (Multi-Windows Multitasking, same as in Note II) -Page Buddy -New Gallery App (Same as in Note II) -Notification Panel (Notification Panel can now be customized) -Brightness Slider in Notification Panel Can Now Be Disabled -Smart Rotation (Screen Display adjusts to your angle of sightings) -Continues Input in Samsung Keyboard (Like Swipe or Android 4.2 Keyboard) -Paper Artist App -Group Cast App
the new ping it app allows you to de-register it from your device before flashing meaning no more phone calls to "Tom" at technical support.
Go to more>settings> Cancel my barclays pingit registration
I can't wait till they release it to o2 branded. I don't like messing about with custom roms etc just incase a turn my phone into a £350 paper weight 
I'm now sporting 4.1.2! And I didn't even have to re-register Barclays banking app!
No custom roms involved, the polish rom is a legit rom!
