HTC S710 (Vox) Windows Mobile 6 Smartphone Firmware Update

I noticed there was an update for my HTC S710 (Vox) Windows Mobile smartphone on the HTC Support site. The upgrade does NOT move the phone to 6.1. However, based on the changes in version numbers, the update may be fairly important. My ROM version went from 1.15.405.2 to 1.34.405.1. The radio version went from to Windows Mobile itself remained at version 6.0 (not 6.1).