Sony is beginning to roll out the Android 4.4 KitKat update for several of its Xperia devices, including the Xperia Z1, the Xperia Z1 Compact, and the Xperia Z Ultra. The update includes the latest and greatest from Google’s Android team, as well as some tweaks and updated features from Sony. Aside from updating the guts of the software to Android 4.4, Sony is including a tweaked status bar and quick notification toggles and some interface revamps to make it feel more similar to Sony’s own Playstation 4.
The update also updates Sony’s native apps on the devices, including apps like MyXperia, Smart Connect, and Smart Social Camera, and several of Sony’s other media apps are getting cloud integration with Sony Entertainment Network.
Possibly the best addition of all is the inclusion of Xperia Themes for all of these devices. Users will be able to download new themes for their devices that skin everything from the lock screen to the nav bar to app icons.
This update should begin rolling out now for the three devices that are listed. If you don’t own one of those devices, Sony detailed when they are planning on updating some older models to KitKat. The original Xperia Z, Xperia ZL, Xperia Tablet Z, and Xperia ZR will be seeing the update in mid-Q2. The Xperia T2 Ultra, Xperia E1 and Xperia M2 will be getting more details about the update shortly.
source: Sony Blog