We heard early this month that Sony would be releasing a software update for the Xperia Ion, the Sony Xperia Ion Jelly Bean update has now been released and it comes in the form of Android 4.1.2 with build number 6.2.B.0.211.
The Sony Xperia Ion Jelly Bean update has been released as an over the air update, and should be available for the handset as of now.
You can check to see if the Jelly Bean update is available for your Xperia Ion via the settings menu on the handset, if you have received the update, leave a comment and let us know.
Source Xperia Blog