Sony Mobile has confirmed that the Xperia Play’s upgrade to Android 4.0 Ice Cream Sandwich has been canceled, leaving the PlayStation-certified smartphone on Android 2.3 Gingerbread. Sony explains that compatibility and stability issues with the Play’s gaming features are to blame.
Other 2011 Xperia phones are still on track to receive the upgrade to ICS, including the Xperia Arc, Xperia Neo, Xperia Mini, Xperia Mini Pro, Xperia Pro, and Xperia Active. These devices will begin receiving an optional 4.0.4 update through the PC Companion app starting next week.
source: sony blog