Valve has been Linux friendly. It says the new steam frame "is a PC" and will run Steam OS but I feel like there's an insinuation that, like the steam deck, you can install whatever you like. I am cautiously excited at the premise of really digging in and having a Linux box strapped to my face.

Another friend has already referred to it as the Linux Vision Pro.

Edit: watching Linus tech tips review, it mentions side loading Android APKs as well