Adjusting for inflation from when the 370 came out, a price around £45k would be about right. Cayman S is £55k before options, and given the price differences in 2009 between the two I reckon that sounds about right. That said, a 370Z Nismo is just over £40k new now so maybe that’s what they’ll be aiming at.
That puts it smack in the super high 5 year tax bracket though, which may not be the right way to go. But who knows, after all it’s looking likely to be a 370 with a different engine underneath so given how cheap it’s been to create they may allow them to be flexible with the cost. £39,995 would be ideal.