Well hard to say, there's no firm info on the pricing yet. But being a BMW it won't be cheap of course. However, it shouldn't be slow. The production prototype they ran at Goodwood was pulling pretty hard. Check out this vid, about half way thru it does a couple launches and its lifting its front end quite a bit....
https://youtu.be/TiUKTgWDfPM
Engine bay video too before that.
So I've been following supramkv.com and the development of this car quite a bit. I'm non't really interested in acquiring one ever (because its not a Toyota, and it doesn't really seem like its going to be much more then a modern reincarnation of the mk4), but its super interesting and exciting to watch a new supra get developed and released. There have been some great interviews with the Toyota project lead posted there, and a Toyota insider has been dropping some nuggets around the board too. While its true this car is going to be 100% BMW manufactured parts unlike like the FRS, Toyota has been involved in its development far more then you'd think. For instance every part they produced for it they have been shipping dozens of copies over to Toyota Japan to run all of their stress and durability tests on. Many changes have been made to the tooling and part design from feedback from Toyota. Also, Toyota was concerned that the closed deck aluminum block B58 twin turbo 6 they were going to use wouldn't leave enough headroom for the Supra community to play with, so apparently the Supra at least is getting a unique version of the B58 with an all iron block.
We'll see what it costs and what the final stats are, but the pricing of the last Z4 is probably a good guess. This thing should be a more bare bones car then the last z4, hopefully it will be cheaper then its BMW counterpart. Stock for stock it might not be a bargain, but the aftermarket that builds up around it may make it a monster. I'm hopefully. It sounds like the new chassis is super stiff and handles great, and the car is actually a lot smaller then the mk4 so if we get a new supra that's got decent reliability, ok pricing and excellent handling with lots of tuning potential, it could do quite well.