Yesterday Sony announced which devices would be getting the Android 4.3 Jelly Bean update, and they also revealed some more details about Android 4.2.2 for a couple of devices.
Sony has announced that the Sony Xperia Tablet Z will get the Android 4.2.2 Jelly Bean update in early August, they also said the update is headed to the Sony Xperia ZR.
As yet we do not have any details on exactly when the Android 4.2.2 update will be released for the Sony Xperia Tablet Z, as soon as we get some more details we will let you guys know.
Source Xperia Blog