If you're the owner of an Xperia Ion, you've probably been absolutely foaming at the mouth for an upgrade to Ice Cream Sandwich. Today, AT&T announced that the update is available for everyone, just hit up Sony's website and download the Sony companion app for Windows or OS X. It does not appear this will roll out as a standard OTA update, so you'll have to download the app to get it.
The update will bring faster mobile hotspot and Wi-Fi speeds, apparently, as well as improvements to Exchange Active Sync. Of course, all the features that come with Android 4.0, like face unlock, will be wrapped up in this there as well.