A week or so ago when I was in the local shop, a guy came in with his P99c in 9mm. I remarked about preferring the old style frame, but he let me hold it. I remember how there was a loose slide to frame fit that I wasn't expecting, but the entire pistol felt very solid in the hands, despite the short girp (no magazine, I'm sure the extensions are perfect in the hand).
I recall once before that somebody had the old stlye in .40, I think it was a pre-AS. I really liked the trigger on it, and could see one on the compact.
I've been looking for a subcompact, but something large enough to a main carry piece. The Glock 26 and the M&Pc were my main considerations, but I don't really care for the triggers on either. The P99s trigger is as good as a striker fired trigger gets IMO.
In terms of innovation, I've always thought the P99 was the polymer to beat second to the VP70 of course.