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
It can be one button, or it can be 16 buttons or a radial menu or an axis or… I think it’s great especially for older PC games that weren’t designed with gamepads in mind.