Phoronix article: https://www.phoronix.com/news/Steam-Machines-Frame-2026
Also listed here: https://store.steampowered.com/sale/hardware
Valve has already sent support for the new Steam Controller upstream: https://www.phoronix.com/news/New-Steam-Controller-SDL
I mean officially the steam controller updates were discontinued in 2023 for the internal configurator and everything like that any current updates or anything like that is either the third party or being hacked together by people using it.