The first models to receive the new version of Android will be the T Xperia,Xperia TX and V and will do in about February. Later others will follow as the Xperia S, Xperia acro S, Xperia ion, Xperia S, Xperia Xperia J go and, although not yet specified an exact date them.
Regarding Xperia models released in 2011 and earlier may only have Android 4.0 or less. Sony decided that after making an assessment of the terminals.