
A mere 0.1 ahead of Android 4.0 Ice Cream Sandwich, we are being formally introduced to next major update to Android, known as Jelly Bean (Android 4.1). It’s going to usher in incremental improvement and new features for users to enjoy.
Project Butter

Google has unveiled project butter, a major effort to squash Android’s frequent problems with device lag, as well as Systrace to help diagnose performance. Project Butter lets the CPU and graphics run in parallel, rather than crash into each other, and has a big impact on both real and perceived speed: the entire interface runs at 60 frames per second on sufficiently fast hardware.Graphics are now triple-buffered to keep scrolling and transitions humming along, and the processor will swing into full gear the moment you touch the screen to keep input lag to a minimum. Systrace, in the meantime, will help developers stamp out what performance hiccups remain. The tracing tool will be a part of the Jelly Bean SDK, so every coder can get an app running in tip-top shape.
Enhanced Predictive Keyboard & Offline Voice Typing

A refined dictionary and an improved predictive keyboard will also speed up typing as well – with expanded language support including Persian, Hindi and Thai and Braille adapters, the keyboard looks set to improve the typing experience exponentially. Not only that, Jelly Bean will feature a new offline voice typing feature – you can type with your voice even without a working connection – and will be launching with US English first with more languages to follow up later.
Home screen tweaks

Jelly Bean update makes a home screen that’s easier to get along with. It will automatically accommodate your apps and widgets and you may get rid of unwanted apps and widgets with a quick swipe up and off the home screen.
Google Now
Jelly Bean provides you a personal assistant called Google Now. The feature uses personal data in your smartphone and retrieves helpful and informative data to help you in your day-to-day life. This combination will aid you in different areas of your life – for e.g., it can provide public transit information when you are close to a station, update you on sports teams in real-time, study your commute habits and retrieve location data like restaurants and so forth.
The Google Now extends its intelligence even to flight details – it will update flight details with terminal and gate information as you are about to board your flight. It doesn’t just stop there – while in a foreign country, it will offer helpful information on currency exchange and so forth.

Voice Search

Harnessing the power of its existing Knowledge Graph - simply put, it is “a huge collection of the people, places and things in the world” -, Google Search will be much quicker, intuitive and fluid. Responses will be screened on answer cards – and this extends to their newly-introduced voice search assistant which is rather similar to Siri or Samsung’s S-Voice. Simply ask Google a question (searching for images is also possible, as seen from above) and answer cards will also be shown.
Notifications

Jelly Bean adds a couple of touches that will make it easier for users to get to where they want and what they want to do in fewer steps. The notifications tray will spot a new look with more information and features; take for example, you will be able to call back or message straight from the notifications tray when there’s a missed call.
Users can also take a quick look at updates on apps without having to go into the apps – the information can be selectively viewed by opening and closing with a two-finger swipe.
Camera Updates

Jelly Bean enhances Ice Cream Sandwich’s fast image capture by making it much easier to view, delete and retrieve deleted photos. Android 4.1 allows you to simply pinch while viewing photos to activate the film strip view feature. This will enable users to view your photo roll quickly by simply swiping left or right. Similarly, swipe up or down to delete your photos. Another good thing is these deletes can be easily undone, so there’s no worries of accidentally deleting a precious shot with no chance of retrieval.
More information available at :
http://www.hardwarezone.com.my/feature-google-io-2012-android-41-jelly-bean-detailed
http://www.engadget.com/2012/06/28/android-4-1-jelly-bean-review-a-look-at-whats-changed-in-googl/