I am interested in the device. I probably won't build a PC, but if this comes along as how I envision it, then I'll gladly add it to my PS4 and Wii U if the price is right.

He clearly states at 21:40 mark about software and development fragmentation on closed platforms which is false.

The post you made is also something that he states, and while it sounds noble, you have to wonder how honest his motives are. He owns a proprietary storefront and is fighting tooth and nail to make sure this lives on in the wake of iOS, Android and Windows ecosystems.

He may talk about "openness", but Steam is as closed as Xbox Live, with 70/30 split royalties and I have a feeling that he knows that he can't fund a proprietary platform to compete with iOS, MS and Google, hence Linux is all he's got. 

I already have a Steambox.

Fragmentatin in terms of of there being different closed platforms in the living room and mobile. He is advocating that having an open platform (eg Linux) wherever you are would allow developers to build once and consumers to take their content wherever. For example Linux bassed Steam box in the living room, Linux bassed tablets etc for mobile. Which would mean for example a game like Godus could be brought on Steam for example, and be played wherever you are. With the current models of being closed platforms in each space (Consoles, iOS etc) you would have a different product whever you are. I belive that the hardware he mentions there is probably the trackball bassed controler they patented for more mouse like control on the couch.

He has also said many times the end goal with Steam is to open it up as a set of APIs that would allow anyone to set up their own store front and put any software theyt  want on it. Naturally with a cut going to Valve as servers are expensive and they are still a business. The increased automation in the selection process that they have made in parallel to Greenlight is the first step towards that goal.