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I'm using a Xperia Active and Android 4.0 for this device has rolled out. I've waited for severals monnths but there are no update for my phone. Sony PC Companion and Xperia Active's Update Center still says that I'm having the lastest software on my phone (4.0.2.0.84). I purchased it in November, 2012 and I don't want to throw away this excellent device too soon.
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most likely the updates hasn't been approved by your carrier and/or in your region.
Here is an alternative
http://talk.sonymobile.com/thread/38251
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Mine is SIM Free. I'm from Vietnam and carriers here don't carry any phone but iPhone.So it's likely not support in my region.
even SIM free phones have to go through approval, dont forget to create a backup of your current firmware, just in case you don't like ICS
once you flash ICS make sure to repair your phone with SUS or PCC that should improve performance.