Everyone and their grandmother by now has lamented the lack of Android 4.0 Ice Cream Sandwich on the Xperia S. Why would Sony want to launch a flagship phone in 2012 without the latest version of Android is beyond us. They promised an update in future but never gave any concrete dates. However, it seems that you won't have to wait too long now to get the update.
While there is still no official confirmation, one of the members of Sony support staff commented on their forum that the official Android 4.0 update for the Xperia S will start rolling out by late May/early June. As usual, he mentions that not all phones will get it simultaneously but that's the general time period by which you can expect to get an update for your Xperia S.
as it turns out, ICS for this phone will roll late Q2... so that's end of June... delaying is Sony's new hobby. http://www.mobilebloom.com/ics-to-land-on-the-sony-xperia-s-towards-the-end-of-q2/2214117/
Any updates on the date for launchin 4.0 update for sony xperia S??