The next Sony software rollout for Xperia Z Ultra, Xperia Z1 and Xperia Z1 Compact starts right about now The update brings some of Sony's own experiences on Google's KitKat release in addition to a few performance tweaks:

• Google's Android 4.4; KitKat as standard - bringing performance & UI optimisation?

• Sony has added its tweaked Status Bar and Quick Settings' now more customisable and clean, to offer the notifications you really need

• If you've got a Sony PlayStation 4, you might recognize a new user interface - Sony added the same sleek launch animation and livewallpaper across the lock and home screens

• Sony is also uplifting its entire native app portfolio to the latest versions - bringing tweaked / improved / current experiences for Messaging, MyXperia, Smart Connect, Small apps, TrackID, TrackID TV, Sony Select, Smart Social Camera and?

• Sony's Media apps: WALKMAN, Album and Movies, with Sony Entertainment Network cloud service integration - Sony Entertainment Network & PlayMemories integration with a new UI and better download speeds

• Sony's custom interface experience: "Xperia Themes", with downloadable UI packs from Sony Select - skin up to 280 assets across your Xperia smartphone with a variety of styles

Next up, Sony will start rolling Android 4.4 KitKat for Xperia Z, Xperia ZL, Xperia Tablet Z - and Xperia ZR - from mid-Q2.

The company will also make Android 4.4; KitKat available for Xperia T2 Ultra, Xperia E1 and Xperia M2.