Sony Mobile in a blogpost clarifies that the Google Android 4.4 KitKat bundled in the software update brings performance and user interface optimisations. Sony has tweaked the Quick Settings menu and Status bar, making them easily customisable. Sony has also bundled downloadable User Interface tweaking packs from the Sony Select app to choose different Xperia Themes for the smartphones.
The software update also improves and tweaks the native Sony packaged apps such as MyXperia, Smart Connect, TrackID, Smart Social and others. Sony has added Sony Entertainment Network and PlayMemories cloud service integration for the WALKMAN, Album, and Movies app. System-wide performance tweaks would be implemented post update.
Sony Mobile also promises to release Android 4.4 KitKat update for Xperia Z, Xperia ZL, Xperia ZR, and Xperia Tablet Z in coming few months. In second half of this year, Sony plans to release the Android 4.4 KitKat update for the Xperia T2 Ultra, Xperia E1 and Xperia M2 devices.