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
Because it’s so bottom-heavy. But if you look where your hands will be it’s essentially a Dualshock with touchpads stuck to the bottom.