Sony plying still fix bugs and increase stability for Android version 4.2.2 is available in the
Xperia Z,
Xperia Tablet Z. Users are impatient and do not claim to
Android 4.3 / 4 soon again.
The latest firmware Sony has released the code is 10.3.1.A.2.74, compared with the old firmware 10.3.1.A.2.67 it is clear that this is only a minor bug fix. No information about the new features, but perhaps do not have the new firmware did not update you, remember to connect to PC Companion!