Well N8 is selling for 470 euros now and at the time N9 comes out i would expect that price to drop more. I wouldn't be surprised at all if Nokia's flagship, N9 costs ~600 euros.
I mean Nokia haven't even had real high end portfolio for over a year already and i would think N9 wont have xenon. Thing that puzzles me is how could N8 camera module fit to N9? Guy over MR did say that the camera would have AF still.

A9 core to me would be much bigger surprise than any N8 camera module in a same time something i would rather see than amazing camera.