Autocar was saying the 370z will be priced at £27.5k and £32.5k for the base/GT model. And that the GTR will now be £57k-£59k.
Anyway, as others have said, newer 350z's will/have already taken a massive hit... and i think that will continue with the release of the 370z, but older models will not suffer anywhere near as badly, if at all, as they've already been spanked!