Latest names of Xperia phones to receive an Ice Cream Sandwich are Xperia Arc and Xperia Neo. This update is rated with Android 4.0.4 however older kernel 2.6.32 will be used.
It is important to keep in mind that this update is not over-the-air (OTA) so be sure to hook up your phones in your desktop and pull-up PC Companion. This update is only rolled in progressive stages so there is a great possibility that this could not be available in your unit yet.
However, if you want to check if your unit is good for the update just check this site for Xperia Arc and this one for Xperia Neo. It’s better to check into your PC companion in the coming days for this update.
Other Xperias that will be receiving the ICS update this year are Xperia mini, Xperia mini pro, Xperia pro, Xperia active and Live with Walkman. Sad thing Xperia Play will not be getting any update. So, you should try to check your device now and let us know how ICS treats your Xperia.