Jelly Bean is faster and ads some great new features like Google Now and the Samsung Galaxy S III will be one of the early devices to get the update. Check out the following video which shows what's new in Android 4.1 Jelly Bean on the Samsung Galaxy S III compared to Ice Cream Sandwich.
Remember that Jelly Bean is still not available to all Galaxy S III devices. Android 4.1.1 Jelly Bean along with an updated version of Samsung’s TouchWiz will be available for the Samsung Galaxy S III in the near future.
source – PocketNow