It is currently known that Xperia Z, Xperia ZR, Xperia ZL and Xperia Tablet Z started running this update.
The new package includes improvements of the previous OS versions. In addition, it improves the Wi-Fi performance, increases endurance and makes some innovations to the work with e-mail.
The update will be carried out in several stages, but in the next few weeks Xperia Z, ZR, ZL and Tablet Z worldwide will get it.