To read through the full update patch notes, be sure to check out the blog post from Valve on Steam. Outside of controller support, the update also brings with it a number of fixes such as fixing playback of certain game preview videos in Steam Client, and fixing the Steam Overlay not working with Vulkan 1.3 applications, among other things. Fixed incorrect controller configuration loading when starting a Remote Play stream.Fixed the "Your other games" section in the desktop version of the configurator not showing results.
Enable improved rumble emulation on DualSense(tm) Wireless Controllers with updated firmware.