Redesigned Notification Shade
Redesigned date and time section
TouchWiz settings underneath new date and time section
Stock Jelly Bean expandable notifications functionality included
Certain Samsung applications include button controls from the notification shade

File Transfers over Android Beam
Android Beam now available alongside “S Beam” application
File transfers slower than “S Beam” as they are handled over Bluetooth

Task Switcher and Google Now
New Google Search and Google Now applications
Due to lack of on-screen keys, new button at the bottom of the task switcher has been added to launch Google Now
New button is accessible by long pressing the Home key
Basic and Easy Home Screen Modes
New home screen switching modes

“Basic Mode” consists of standard arrangement of icons and widgets, just as stock Jelly Bean
“Easy Mode” is a new and intuitive setting designed for first-time smartphone owners. It automatically fills in home screens with large widgets displaying favorite settings, applications and contacts
The modes can be switched through the Mode Control section in the Settings menu

Help Application
Geared towards first-time smartphone owners
Offers walkthroughs of basic tasks of keys, the lock screen, notification bar, wireless and networking settings, and setting ringtones

S Note Lite
Replaces “S Memo” application
It is a stripped down version of the Galaxy Note’s “S Note” application
Capable of creating multimedia notes consisting of texts, sound, video, drawings and voice recordings

Dormant Mode
Similar to iOS 6′s “Do Not Disturb” mode
Turn off specific notifications and events entirely or during specific hours
Block incoming calls
Disable the LED
Customize emergency controls, such as only receiving emergency calls from select contacts

Other Features
“S Planner” application has undergone a slight visual overhaul — the lines are cleaner and clearer, and it’s easier to tell what’s going on when multiple events are overlapping
The option to limit background data usage, which was confusingly absent from ICS-based Galaxy S III firmware is now available in the Jelly Bean update
They also noted that there weren’t any obvious performance gains, mainly because the phone is already blistering fast running Ice Cream Sandwich. They also expect this update to be available soon as the performance and stability appear to be ready for rollout.