Mazda MX-5 Miata RF Kuro and Speedster concepts
Mazda did the most sensible thing possible for SEMA, and brought two aspirational Miatas. The first, the white Speedster, is basically a poster car designed to be as lightweight as possible for performance, without an eye toward production. It doesn't weigh a ton, and I mean that literally -- the whole car weighs just 1,980lbs.
The other car, the RF Kuro, is based on the upcoming Miata RF, and features (not unlike the Speedster) the suspension and instrumentation display from Mazda's Miata Cup race car. This is Mazda's way of saying "if you want the best-handling car without going broke, come talk to us."