Samsung has plans to update the Galaxy S III around December to Android 4.1.2
This information has been confirmed by SamMobile Admin Danny.
(I9300XXD = 4.1.1 I9300XXE = 4.1.2 (with multi-view))
The update will make the phone more stable and will have an extra feature called multi-view.
Samsung uses this feature also in their new Galaxy Note II.
From our Galaxy Note II review
● Multi-View: This feature allows the user to truly multi-task. The user can divide screen in two pieces and select 2 apps to show at the same time. So you can follow your tweets and Facebook at the same time just “AWESOME “