This is an upgrade of version 8.10.14219 that has been used to add some useful features such as adding mobile data shortcut buttons on the notification bar or Cortana in some other countries.
In fact, if you check all the recent leak updates of Windows Phone 8.1 update 1, you can see the version 8.10.14203.306 has provided a surprise update feature, displaying% battery on Live Tile interface.
Version 8.10.14192.280 uses critical update testing or version 8.10.14176 previously used to fix updates and disseminate updates to HTC devices.
However, this new version is not clear what kind of feature it will bring, so it will take a while to know more about it.