I checked and didn't see this info anywhere on here, had to translate the page but this says sign up by 10/2 to not miss anything. Lets you sign up for an email with new information.
https://www.toyota.de/motorsport/neue-toyota-supra.json
The only thing I know for sure, is that Toyota re-certified the "Supra" name. The rumor is also that the production version will be the same size wise as the racing one we see in a few days, less the wing, and that there will be 3 trim levels.
I work at a Toyota dealership, they have been super secretive even to us. Cant wait though, as long as its pretty solid I'll be ordering one to fit next to the GT-R