If you're one of the many enthusiasts out there oohing and ahhing over the pair of pre-production Mini concepts that debuted in Frankfurt today, know that the BMW division isn't the only one here with a tempting speedster on display. Amidst all the exciting and pivotal new vehicle debuts at the show, Mazda took the wraps off the MX-5 Superlight Version.Unfortunately it's just a show car, and it's not the first time Mazda's toyed with the idea (and...