The list of devices which will “not receive any further software upgrade support” includes the following models: Xperia arc S, Xperia S, Xperia SL, Xperia ion, Xperia acro S, Xperia go, Xperia P, Xperia J, Xperia miro, Xperia sola, Xperia tipo and Xperia U.
www[dot]androidauthority[dot]com/sony-ends-support-xperia-u-342276/
www[dot]androidauthority[dot]com/sony-ends-support-xperia-u-342276/