Samsung has begun rolling out Android 4.4.2 KitKat for the Galaxy Mega 6.3, launched last year with Android 4.2 Jelly Bean. The build of the update is I9200XXUDNE4 and is now available in Russia through Samsung Kies. It if goes smooth here, the update will be rolled out to other regions soon.
At present this is not an OTA update, but we expect the un-tethered update too will be available which you can check from About screen. Lot of new things are in store including better performance, improved battery life, white status bar icons, wireless printing support and more. Do tell us if you find something new in the KitKat update for your Galaxy Mega 6.3.