The Android 4.2 Jelly Bean update which Sony had stated will be made available soon after the launch of the Xperia Z seems to have been released in certain regions of the world. Users of the device in these regions who have carrier support as well as those without carrier support are able to update their Android version.
The Android update for the Xperia Z device comes after the update for the Xperia ZL model was released last week. The same for the Xperia Z though is a bit late considering Sony had promised it back in February itself which was when the smartphone was launched. XperiaBlog reports that both the LTE as well as some HSPA+ models of the Xperia have received the update in the regions where the update has been made available. As for the update being released in in other parts of the world, it seems we got to wait till July
The update which Sony is releasing would not just be updates to the OS but also functions which are controlled by the applications built by Sony. The overall effect of the update therefore would be quite interesting and distinct. After the update the OS version would be Android 4.2.2 Jelly Bean. This update for the Sony Xperia Z devices by Google would be soon followed by Google releasing an update for the Android running on their own Nexus devices. That update would push the version running on the devices to Android 4.3 Jelly Bean.
Given these updates being released in a short span of time from now, we can very well expect the T-Mobile Xperia Z set to be coming with Android 4.2 Jelly Bean. The device is set for release this summer.