With Android 4.4.3 KitKat in tow, just what kind of improvements can one expect from it? Not too much actually, apart from the slew of usual minor tweaks and security enhancements that Google decided to throw to go along with it. Not only that, Sony has done a wee bit of work on their side, helping to optimize the memory consumption as well as smooth up performance all the more.
In addition, the Sony Xperia T2 Ultra will also be on the receiving end of several stability improvements with a number of discrepancies and bugs being put to bed for good. Where functionality and user interface are concerned, not much else has changed, so do not expect your Sony Xperia T2 Ultra to act otherwise after applying the update.