They announced the controller today, Steam Controller after the OS and boxes earlier the week. I have to admit, I am thinking that I won't get the 'next gen' consoles, and rather aim for SteamOS to be on my TV in the future. I'm very excited.
I don't like the look of the controller, But I am looking forward to having this in my living room. also who sign up for the beta? Steam Machines
Below is a critique of the upcoming "console" from Valve that I thought some of you might be interested in reading: Steam Machines Are Pointless And Valve Is Struggling To Keep SteamOS Relevant - Forbes