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 gave that a shot a few months ago, no dice, the Wi-Fi chip on my motherboard is too new.
I’ll flash it again with current FW and see if that helps.