A new Steam client has been released and will be automatically downloaded.

General
  • Fix long delay before first game launch of the session for users with thousands of shared screenshots
Remote Play
  • Added 40 Mbit and 75 Mbit custom bitrate options
  • Fixed controller hotplug support for Unity games
  • Replaced the menubar with an overlay that comes up when holding the ESC key
  • Only show keyboard and controller toasts if there's input from those devices
  • Fixed non-breaking-space display in French and German
  • Fixed font rendering in Chinese, Japanese, Korean, Thai, and Vietnamese
Steam Cloud
  • Improve performance by uploading/downloading multiple files in parallel
Soundtracks
  • Added support for localized album covers
SteamNetworkingSockets
  • Improved peer-to-peer routing to better utilize relays in data centers not connected to the Valve backbone

More...