Project Q is the upcoming streaming only device that will allow you to play games installed on a PlayStation 5 remotely.
It has not been announced if the handheld will allow streaming of games from the cloud and is rumoured to cost between £250 - £300.
Will you be picking one up later this year?
Yes you can plug the steam deck into an official deck or just a USB hub with hdmi. It will then display on TV and allows controller input. So yes, it works like a switch in that respect.