According to AutoCar, the idea started way back in 05/2012.
https://www.autocar.co.uk/car-news/confidential/autocar-confidential-lynkcos-strategy-toyota-supra-internet-sales-more
The thread was moved to another section.
https://www.supramkv.com/threads/production-ready-renderings-of-the-toyota-supra-bmw-z4-post-up-your-fan-art.396/
I think this one is closer to the prototype.
AutoNews say they are going to make less than 10,000 units a year.
https://www.supramkv.com/threads/2019-toyota-supra-production-to-begin-2018-by-magna-steyr-austrian-manufacturer.278/
This is Toyota Europe. Of course its going to cost more over there. For example:
US 86: $26,255 USD
UK 86: £26,885 ($38,429 USD)
US Corolla iM: $18,850
UK Auris: £20,160 ($28,820 USD)
US Rav4: $24,510
UK Rav4: £27,495 ($39,306 USD)