Two new firmwares for the Galaxy S III (GT-I9300) and Galaxy Note II (GT-N7100) were leaked - I9300XXUGMK6 and N7100XXUEMK9.

We advice that you wait until Samsung officially releases the firmware and update your device via OTA or via Samsung KIES. However if you cannot wait, then you can manually update through the firmware download from SamMobile.

CHANGES AND IMPROVEMENTS IN ANDROID 4.3 UPDATE

• - GALAXY GEAR Support
• - TRIM Support (Makes the device much faster)
• - Samsung KNOX [Only in Galaxy Note II]
• - Samsung Wallet (Pre-loaded) [Only in Galaxy Note II]
• - Better RAM management
• - Core UI elements updated to the ones on the Galaxy S4 (Galaxy S4′s theme all over)
• - New Samsung Keyboard
• - GPU drivers have been updated (Higher GPU benchmark scores)
• - New Lockscreen: Multiple Widgets, improved ripple effect than Android 4.1.2, ability to change clock size and set a personal message
• - New screen modes (From S4): Adapt Display and Professional Photo
• - Daydream
• - Driving mode
• - Actionable notifications
• - Move-to-SD-card feature
• - New Camera mode : Sound and Shot
• - New Additions in Notification Centre
• - Completely revamped Settings UI (Tabbed interface - Exactly like the Galaxy S4)
• - Implementation of Voice controls (Let's you control various parts of the phone using voice commands - Galaxy S4 feature)
• - New Samsung Apps: Calculator, Clock, Contacts, Gallery, Music
• - Full screen Samsung apps
• - New S-Voice (from Galaxy S4)

Full instructions are on SamMobile