See, this is exactly my point. You've thought things through and come up with some good arguments about the prototype and it's (mocked up) user interface, and made a judgement accordingly. That's cool.
There are others, like the person I quoted earlier, who have explicitly said that the primary reason they didn't like it is because it was made by Microsoft. There are others who would say the same about any device made by Apple. "Oh, it's made by ___, therefore it's crap." And that's just being fanatical.
Yes, it's true that past performance is an indicator of future outcomes. One could argue that Microsoft has, in the past, had a history of not coming out with the devices it demos, or has a history of technical or user interface design issues, therefore it might be reasonable to believe that this product will also be flawed. But to immediately dismiss it is "that's obviously how it's going to turn out" is short-sighted and narrow-minded. How many times has Apple come up with an idea that people dismissed as "nothing to see here, folks" and then turned out to be very, very wrong?
Some people in this thread seem to have this attitude of, "Pffft, who cares what Microsoft does, Apple is obviously going to be better". Sometimes that's manifested as, "This is an Apple fan site, why are we talking about Microsoft?" I say you always have to be watching out for what the competition is doing, because you just never know.