Sony has started rolling up the Android 4.1.2 software update for both the Xperia SP C5302 HSPA+ and the Xperia SP C5303 LTE. The update brings the phone's firmware to version 12.0.A.2.245 and users report that although it's not Android 4.2.2, it brings the UI visuals to almost perfectly match the Xperia Z's. In the software update for the the Xperia SP,which is based on Android 4.1.2,...
Source: http://www.gsmarena.com/sony_launches_android_412_update_for_the_xperia_sp-news-6562.php