Devices are :
•Xperia TX and
•Xperia V .
the owners of Xperia SP should wait a bit because it was still studying the possibility of updating this phone to Kit Kat. It is noteworthy that the devices that stop supporting had been issued in 2012, a copy of Android 4.0 (Ice Cream Sandwich) and has since received a major updates. While the SP has been issued in the year 2013 with a copy of 4.1 (Jelly bean).
If you are one of the owners of the devices listed this must be a bad news for you hopefully that Sony decides that it can update the device SP to Android version 4.4.