Sony Xperia Arc S lovers like me are dying to get the new Android 4.0 Ice Cream Sandwich updates this month.  You need to keep an eye on this Sony Mobile forum thread where all of the kit numbers that receive the update will be posted. You can find your kit number by accessing the service menu on your handset (type *#*#7378423#*#*). Then hit Service info > Software info and look for the ‘Customization Version’ of your Xperia. This update will only take place via your PC or Mac, so there will be no OTA option.