That is already possible without the Looking Glass. Just regular libvirt GPU passthrough. I would say the use case here would be a machine that does not have a

That is already possible without the Looking Glass. Just regular libvirt GPU passthrough. I would say the use case here would be a machine that does not have a monitor connected, for example some Bitcoin mining server in the attic. With Looking Glass the game screen can get streamed to a ultrabook in your living room, with the server GPU performance