"With the holiday season around the corner, we’re happy to confirm that the first 2011 Xperia™ smartphones will be upgraded to Android 4.0 starting from end March/early April 2012. The first smartphones to get the upgrade are Xperia™ arc S, Xperia™ neo V and Xperia™ ray. Soon after, starting from end April/early May, Xperia™ arc, Xperia™ PLAY, Xperia™ neo, Xperia™ mini and mini pro, Xperia™ pro, Xperia™ active as well as Sony Ericsson Live with Walkman™ will get their upgrades."
Taken from Here