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
even more nuts is that it will support pc games via FEX, an emulation layer that runs x86 windows games on ARM in Linux
In addition to streaming from your battlestation