1. Project Butter aims to make Android devices lag-free
“Buttery graphics and silky transitions” is what you deserve with an operating system and that’s what Jelly Bean aims to finally bring to Android. Touch responses are getting faster in JB and switching apps is getting smoother.
2. Google Now brings time and location-aware search and suggestions
Google Now knows where and when you are thanks to the phone’s sensors, and it uses this information along with Google’s Knowledge Graph to bring you search results and suggestions for the places you are and the times you visit them. It will initially be available in the United States.
3. Jelly Bean comes with ”Actionable” notifications
Actionable here means that you can take action directly from the notification bar. Say you have a missed call – you can now call back directly from the notification drop down.
4. Widgets resize automatically to fit your screen
Widgets are now smarter and if you try to move a large widget to a screen with little space it will automatically resize to fit and other icons automatically figure out where to move to empty the needed space.
5. JB has a brand new Gallery with filmstrip view and swiping gestures to delete photos
Zero shutter lag and burst shots came with ICS, and this definitely results in tons more photos. JB brings a quick and easy way to view and delete the unnecessary ones with filmstrip view in the gallery.
6. The keyboard is now smarter with better autocorrect.
Android Jelly Bean now comes with improved dictionaries. Predictive input gets really predictive and sometimes would even guess the word you want to type before you do.
7. Android now comes with Offline Voice Dictation
Best of all, now you don’t need to be connected to the network for voice dictation – it works offline.
8. Accessibility is improved with Braille support and plugins for USB and Bluetooth output devices
Blind users now get touch and swipe gestures to navigate the UI, and accessibility is improved.
9. Android Beam comes to NFC Jelly Bean phones
Phones with NFC and Jelly Bean will get the Android Beam function that allows sharing of contacts, pages, YouTube videos and more in a second.
10. Search gets a complete overhaul
The new search gets a visual overhaul to match the added power of the Knowledge Graph.
11. Intelligent voice search that speaks back to you
You’ve been able to search the web with your voice for a while on Android, but now the phone will speak back to you with intelligent answers.
12. Google Now cards pop up on your screen when and where you need them
Google Now will automatically pop up relevant cards when you’re at a particular location. You’re in an airport? Your boarding pass should be right there for you.