No, there's no good reason for the solar shingles to use inferior PV cells, but they do. The shingle design is bad because they're much smaller than a typical panel, requiring much more wiring for a given surface area.
I'm guessing that they'll have something that mimics a metal roof more than a shingle roof, but we'll find out soon enough.
What would be absolutely revolutionary would be something that is self-healing, such that roofers can drive nails through it, cut holes in it, etc., and have it still work. Just roll out sheets of it over the wood, nail it down, and hook up wires at the top (running down through the attic to the side of the house). I don't think we're going to see that anytime soon.