According to a report, the Sony Xperia Z is finally getting its Android 4.2.2 Jelly Bean update in select regions of this world. Hong Kong and Spain has started receiving the update and those are phones that are generic (which I believe means an unlocked non-carrier Xperia Z). The update is not via OTA so people who own the device needs their PCs and their PC Companion in order to get the update. Xperia Zs with carrier customizations (those bought via a carrier contract) in the Czech Republic, Austria, and The Netherlands have also been reported to have started rolling out. In Taiwan, generic Xperia Zs are also getting the same update.
Source: Android Police