Owners of the Xperia Play, it's time to curl up with a teddy bear and your favorite ice cream -- just as long as it's not in sandwich form. After the sudden and unexplained disappearance of the "PlayStation Phone" from the Android 4.0 upgrade list yesterday, Sony has followed it up with a full confirmation accompanied by the usual explanation. As you may have already guessed, the manufacturer tells us that after extensive testing, it was determined that "a consistent and stable experience, particularly with gaming, cannot be guaranteed for this smartphone on Ice Cream Sandwich... in this instance the ICS upgrade would have compromised stability." Sony went on to discuss that it received similar feedback from the developer community after releasing a beta ROM. Still, after being told repeatedly that theentire 2011 smartphone lineup would receive the update, we can't help but be a bit heartbroken by the news.
In the same breath, however, Sony also updated its timeline for the rest of the lineup that is still on schedule to receive upgrades to Ice Cream Sandwich: the Xperia arc, neo, mini, mini pro, pro, active and Sony Ericsson Live with Walkman will begin receiving their refreshes next week. The Xperia S is still on track for an end of June rollout, with the Xperia P closely following it and the Xperia U sometime in the third quarter. It's just unfortunate that the good tidings must be balanced out by equally horrible news, depending on which device you own.

http://www.engadget.com/2012/05/25/sony-ics-updates/