Valve have pushed out the latest updates for the Steam Client to everyone, and this update is a little on the exciting side with new hardware.
When it comes to new controllers being released, Valve seem to act pretty quickly on getting it all hooked up with Steam Input. As of this Steam Client release, you should find that the Sony DualSense (PlayStation 5 controller) should now work including trackpad, gyro, lightbar, and rumble functionality with any games that support Steam Input. Valve also added in a directional swipe mode for trackpads and gyro, better support for games that use raw input and some bug fixes.
On the Linux side things get interesting too. Not only have Valve improved the performance of Steam's web browser they also noted all these fixes and improvements just for Linux:
- Updated steam runtime to v0.20201203.1
- Improved the filtering of available compatibility tools in the game properties dialog
- Fixed launching of non-Steam games over Proton 5.13
- Fixed games not getting stopped via the 'Stop' button in the client UI
- Added auto-migration of Steam libraries using the old 'SteamApps' directory casing to 'steamapps' when possible. Users will be warned if the transition is needed but auto-migration fails.
- Improved how host LD_LIBRARY_PATH settings are picked up and transformed for the Steam runtime
- Improved host LD_LIBRARY_PATH support
- Fixed blank UI windows appearing at startup on some systems
See the announcement here.