Not to be a party pooper, but doing some digging we have already seen a number of test cars with both BMW and Toyota plates. I just don't think we should be getting overly excited just yet. :dunno...
Toyota Supra Gets a Taste of Manhart’s Aftermarket Goodness
https://www.autoevolution.com/news/toyota-supra-gets-a-taste-of-manharts-aftermarket-goodness-148800.html
https://bestcarweb.jp/news/196381
The Nissan Z Proto Is Exactly What Toyota Should Have Done With The Supra
https://www.carthrottle.com/post/the-nissan-z-proto-is-exactly-what-toyota-should-have-done-with-the-supra/