The new features are an option to auto-size thumbnails, and (mainly for those looking to migrate to another app), a CSV export option. For more details on the export, open Usher’s help, and you’ll find some instructions at the top of the first page. If you’re really bored, you can read the full release notes.
Because Usher is no longer available in the App Store, this update is only available to users of the direct version. Usher App Store users, please crossgrade (it’s free) to the direct version in order to get this update.