Samsung Galaxy Grand Duos Android 4.2.2 Jelly Bean firmware is leaked by Sammobile. It is an early build and still in test phase. But that should not discourage you to try your hand on the latest software. The noticeable features come with the upgrade are transparent notification bar, Day dream, Smart Stay, lens glare effect unlocking and improved battery life.
Though Samsung officially did not announce availability of Android 4.2.2 upgrade, but Sammobile believes that Galaxy S III, Galaxy Note II, Galaxy Grand Duos and few other tablets will get the upgrade this quarter.
Checkout the video to know what exactly you will get after upgrading to Android 4.2.2.