Sony has released a new firmware version for the Xperia U (ST25) with build number 6.1.1.B.1.100. The Android 4.0.4 Ice Cream Sandwich firmware keeps the 3.0.8 kernel. We are not aware of any tangible changes over the previous version (6.1.1.B.1.89), so it is likely to offer minor bug fixes. If you have downloaded it let us know what differences you have noticed.
Thanks Aaron!