We do know that people from Mazda do monitor this forum. If you do a search (or just look back manually) you'll find a few mentions of it. It was in an article that I posted, and I think it was mentioned tangentially at Sevenstock, among other places.
Mazda is well aware of how enthusicastic people are about the car. They were at Sevenstock, and from what I hear they've strongly supported it for quite a number of years.
I doubt that we'll have any input on the final RX-8, as they're probably getting ready to start manufacturing it. If there is anything even remotely significant (digital/analog dash, sunroof, fold down seats, colors, etc) that hasn't been written in stone by now, I'd be shocked. We're getting whatever we're getting at this point.