1) Contrast. It seems to look nice with a carefully-controlled backlight behind it. How does it look with a Southern California sunset behind it? 2) Black levels. If your "shades" are liquid crystal, they're about as opaque as a pair of Ray Bans. Trust me - turn a light on inside your house after dark and your neighbors will be able to watch you browse facebook on your "window." 3) Ergonomics. Yeah, it always looks cool in movies, but computers in movies go "beepity beepity beepity PANG" too and as we all learned in 1989, that shit gets really old really quick. "Move your whole goddamn arm" UIs are repetitive strain injuries on a stick. There's a reason mouse pads are seldom over 9" wide, even though screens are seldom smaller than 12" - the less you move, the more efficient you are. Swinging your arm around like Polly Powerpoint looks awesome in videos but sucks ass when you have to do it just to check the weather. 4) That big, heinous "no touch" symbol plainly visible below the product demo leads me to believe this is pretty far off. Know those groovy "turn dark magically" windows you see in Blade Runner? They do exist. A friend's lab bought some. They cost $1000/sf just two years ago. And their cycle time is really fuckin' slow. Yeah, welding goggles work but they're a couple hundred bucks for 8 square inches of glass - and they don't do gray levels. They sure as fuck don't do color.
Also, it wouldn't have to be used as an outward facing panel, it could be the glass pane that separates two rooms in your house. Or, it could be the glass between the control room and the "band". You could have your edit screen displayed up there for the band to see. "No track three, right there"..."can you punch me in"? It's the future.
Oh, fuck that. "That which I look at" and "that which I touch" are in different planes. Always have been, always will be. Ergonomics is not a minor issue - "that which can be done easily" is far more likely to be a part of any person's workflow than "that which can be done." All these whizz-bang touchscreens are being driven by ad flacks who watched Minority Report and realized they could sell that. In Hollywood, you can put interfaces like that in after you shoot which allows you to skip the 24-frame playback. Don't for a minute think that they're at all useable.
What about the pane between the engineer and the band being a display screen though? Meaning it only shows what the computer screen shows the engineer. I could see that being beneficial without being cumbersome. But just because you can create something, doesn't mean you should or that there is a market there for it.
Besides, we do this in TV all the time: any output from any camera I care to look at has levels from every track superimposed on the image as I see fit. I'm never not looking at levels when I'm watching the monitor.