If you're using the T-Mobile variant of the slick Sony Xperia Z, check your notification tray - you might have a very welcome waiting for you. According to this T-Mobile support page, the Xperia Z is finally getting an over-the-air update. It's probably not what you were hoping for: the update brings the phone up to Android 4.2. You know, the version that's now over a year old.
If it makes you feel any better, it's been only five months since the Android 4.2 update was sent to the international version of the Xperia Z.