Looks like T-Mobile's Galaxy S3 would not be updated to Android 4.2.2, instead getting the latest 4.3 Jelly Bean build. I guess it's good news for those who wants to get the latest and greatest software updates.
Both the Galaxy S III and Galaxy Note II - introduced as flagship devices last year - are currently running Android 4.1.2 Jelly Bean. And it makes perfect sense for Samsung to start preparing Android 4.3 updates - now that this version is out.
Together with previous rumors so it is unlikely that there is an update to Android 4.2.2 and Samsung devices both with and without branding devices directly update to Android 4.3. therefore remains is the great question of "when".