2018 Mazda MX-5 Miata Grand Touring Release Date –  It was a given this car was on the way, depending on how popular the PRHT model was on the extroverted NC-generation Miata. Mazda used the NY auto show introducing the MX-5 Miata Grand Touring, for Retracting Fastback, a strength-collapsable hardtop edition. The 2018 Mazda MX-5