Two popular Android smartphones has been brought recently to the latest version of the OS – 4.4 KitKat. Sony has launched the official KitKat update for the Xperia Z Ultra phablet. The first device to get it is apparently the C6833 LTE model in Hong Kong. The new firmware is available only over the air for now, but we expect Sony to launch it soon via its PC Companion. We also hope other markets will be joining Hong Kong soon enough.