There are lots of Steam Controller improvements in this new stable Steam Client update, starting with better offline support for controller configurations and personalization, which can now be downloaded for offline use, support for previewing controller configs when importing them, and Steam Controller configuration links.
Yes, there are few other features which had enriched the SteamOS. Also, the Big Picture mode gained a confirmation which appears just before Restarting, Suspending or Shutting Down the client from the system menu. The new update also assures the users of fixed bugs for all supported platforms, along with a couple of issues which are also resolved for the macOS users. Additionally, the Valve engineers managed to improve the error handling for the game files locked by other apps when an update happens, also the sort order of the gaming library will also be able to detect the games which start with Unicode characters or punctuation in their names.