We are expecting the Sony Xperia Android 4.4 KitKat update to be released soon, and now it would appear that the update may land by the end of February.
According to Polish mobile carrier Play, the Sony Xperia Z Android 4.4 KitKat update will be released either at the end of February or at the start of March.
The KitKat update for the Sony Xperia Z will come in the form of Android 4.4.2, and it will bring a wide range of new features to the Xperia Z.
As yet there is no official world from Sony on exactly when the Android 4.4.2 KitKat update will be released for the Sony Xperia Z, as soon as we get some more information we will let you guys know
Source Xperia Blog