"One thing we disliked about dual-screen, both physical and virtual, is that one becomes your 'main' screen and the other your secondary. Your main screen has the user interface, and you can zoom, scroll as normal. Your secondary screen doesn't have an interface, and doesn't allow you to scroll around the battlefield using the arrow keys, just zoom in and out on different bits. This makes it more of a 'secondary' rather than 'second' screen - you end up using it more to keep an eye on things than to actively work on it."

I think you should read a bit more of your own things you post.  
With the Wii U, this is much less of a problem.

edit:  Let me also say that having two screens like that is barely any different than opening two tabs, then dragging one tab to the left end of your monitor, and the other on the right.  Not quite the same thing, and likewise with this new system.  It's still a "duplication."  Wii U is optimized for handling these situations, and you have multiple controllers to take advantage of the second screen.  Also there are motion controls for the Wii U, and that system requires a cord to be connected to the TV, which gives you even more limitations.

Did the OUYA give them any ideas? Or is it the Vita i should be comparing it with?

quite possible it could join the Jungle and the Razer Switchblade/Tablet

That is a software (and windows API) limitation not a hardware one. There is no technical reason that this device will have any such limitation, if games decide to support it.

The game console market has just got a heck of a lot more complicated than we imagined not long ago.

For those asking, this is like a Wii U because it can stream games from your PC to the controller, which is awesome. That is one of my favorite parts of the Wii U controller, and I have a LOT of games on Steam. I love my Wii U, and I love streaming things on my Wii U, so I will definetly get this as it will help me go through my massive PC library. Plus, I'm sure it will make a great emulator box on the go as well.

These videos are something else.... https://www.youtube.com/watch?v=A1g6i5ZPU1c

This one has AC3 running on a 4K TV from Project Shield https://www.youtube.com/watch?v=lmfOf1epclc.

Not really it's basically a mini Android tablet with buttons and physical countols that can stream games from a PC.

Except this thing isn't going to be competing with the Wii U.  It's not quite the same thing.  This reminds me of people saying how the Vita + PS3 combo is just the same thing as the Wii U except better (when that's obviously not true).

Aside from a great dedicated gaming library, I like portable gaming (like my 3DS) because of the convenience in size and shape, allowing me to slip it in my pocket if need be, but this really loses that appeal. Also, I'd imagine using the touchscreen would be uncomfortable and the headphone jack being at the back is awkward.

Seeing new hardware like this is cool, but this one doesn't excite me right now.