It currently appears to be targeting Linux, which makes sense considering how much work Valve has put into its Wine distribution, Proton, making gaming on Linux *far* easier than it has ever been.
I hope there are some high end and low end entry points for this, as I could imagine using it for Steam Remote Play Anywhere, sitting in my car at lunch playing some games streamed from my PC at home, or as a full-on powerful device in its own right.
While I'm glad the technology in the Steam Controller is still being used, I'm still bummed that we only got the initial release and that they were canceled. I would have loved to have seen the evolution of that design. Maybe that's coming too! It's Valve, so it's hard to tell.
Check out the full report on Ars Technica: