However, Android 4.4.3 is only being integrated with Samsung's own software and features at the moment, so it will likely not be made available for a month or so (Google will probably roll it out by the end of this month or sometime in June before Google I/O, after which we can expect to see it rolling out to the Galaxy S5 and other devices.) It's also a bit strange that 4.4.3 is currently being integrated into the Galaxy S4 LTE-A – from what we know, Android 4.4.2 is actually being tested on that device, but since it hasn't rolled out yet, we might see the handset skipping directly to 4.4.3 in the future.
As far as older, more modestly powered phones are concerned, it seems that Samsung is on track to follow the time frame that we've seen in the past. Devices like the Galaxy Grand 2, Galaxy Mega 5.8, and the Galaxy Mega 6.3 are undergoing final testing and should get the Android 4.4.2 update sometime in June. Like the Galaxy S4 LTE-A, some of these devices might skip directly to Android 4.4.3 as well, so it's possible that the update's rollout could be pushed into July or later.
