I like the concept. Don't like much else about it. I don't know enough to make a decision though.
I need specs to know whether this thing is going to deliver an experience that I'm willing to pay for.
If not detailed specs, then just what res/fps it can run games at and what the battery life is like. Does the dock have an ethernet port?
Most importantly though: will devs support it beyond the first year? I don't think I'll ever be an early adopter of a Nintendo machine again because of the uncertainty surrounding support.