It’s reported that HTC One S in Europe has received OTA (over-the-air) update containing Android 4.0.4 (previously the latest Android version for One S is Android 4.0.3) with HTC Sense 4.1. The update version is 2.31 and it’s about 157 MB.
With this update, users will get HTC Sense UI 4.1. Sense 4.1 comes with improved performance compared to Sense 4.0. Some new features are also added on Sense 4.1 like quick settings on dropdown notification.
The update also gives stability and performance improvement and also some bug fixes. If your HTC One S doesn’t get notification for upgrade, you can go to Settings > About phone > Software updates.