Looks incredibly slick, I'm looking forward to checking it out.

I get the feeling that Adobe are confusing the prototype and design phases though. When you're prototyping, final look and feel don't matter. In fact they get in the way.

The reason why tools such as Balsamiq are useful for prototyping is that they actively discourage the use of images, colors etc in the prototyping phase.

Still keen to kick the tires when it gets released though.