The big advantage of Google Play edition (GPe) devices is the speed at which new Android firmware updates arrive. The Sony Z Ultra GPe is no different and the most recent Android 4.4.3 firmware update is currently rolling out to handsets. This updates the build number to KTU84L.S1.3056.
Android 4.4.3 KitKat primarily introduces a number of bug-fixes over Android 4.4.2, rather than new features. Other changes include a new colour scheme for the Dialler and People apps. There’s no word on when Sony Xperia devices will receive the update, however the company may wait for the next big Android release instead.