All of them are expected to soon get bumped up to 4.2.1 Jelly Bean with its lockscreen widgets and nice little tweaks to the user interface. And unofficially, Android 4.2 has already been released in the form of a leaked ROM. A user Damian Kidd took the 4.2 ROM and flashed it on its Galaxy S III device, bringing us the first look at how Android 4.2 will run on Samsung’s devices.
You can see it in a five-minute video the user recorded showing all the new things coming in Android 4.2 (and of course the way lockscreen widgets are implemented). Take a look below.
source: Damian Kidd