And then Android could use it too, so many apps should just be websites.

The first one worked with some kernel patches, there is a Discord server (Linux Adventures in VR) with lots of information about getting various headsets running in Linux.

If you are interested in Valve you might want to wait, rumor is we get at least an announcement very soon. I say this as someone that pre-order a Bigscreen Beyond 2 though, lol.