Sony has quietly started updating its support pages for the Xperia smartphones that hit the launchpad in 2012. Majority of the smartphones launched in 2012 won't get updated further and would remain stuck on Android 4.0 Ice Cream Sandwich or Android 4.1 Jelly Bean. The pages for the smartphone have been updated with Android 4.0/4.1 as the "Latest & final version."
The 2012 Xperia devices which will remain on Android 4.0 are: Xperia U, Xperia Tipo and Tipo dual, Xperia Sola, Xperia Miro, and Xperia Arc S. Going a step further, the ones which will remain on Android 4.1 Jelly Bean will be: Xperia SL, Xperia Ion, Xperia Acro S, Xperia J, Xperia Go, Xperia S, and Xperia P. Smartphone manufacturers usually provide software support for about 18 months to their devices and Sony just decided that it was time to call quits on updating these.
We really wish that Xperia T, TX and V get Android 4.4 KitKat update and we don't have to hear the regular "we think the devices will have the best user experience on their current software versions" speech from Sony. Just in case you own any of the above mentioned devices and want to update your smartphone badly, you could always turn to third party developers for the same as well.