1) You are correct.
2) It's a demo. It even said that on the link. It's not meant to show actual application. And yes, it is 3D -- check the movie with the wavy dialog boxes. That certainly looks 3D and/or vectorized OS X-style to me.
MS is not going to reveal their tricks while Apple is able to issue a patch to OS X that can co-opt any new interface features before MS's product hits the market. That may sound stupid, but we have no solid idea what the next iteration of Windows is going to look like because MS hasn't said anything other than "it will be 3D". Check the previous pages on that article, it clearly goes into what they have planned, even if it doesn't show it in demo form.
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