The Rocketman city car is set to be an all-electric vehicle, while the Superleggera could become a Mazda MX-5 rival after positive feedback The Mini Rocketman city car and Superleggera Vision roadster concepts could yet make production. Mini product chief Ralph Mahler said the firm was looking at whether a small car “can be a possibility or not” and Mini had “nothing against” making a smaller model such as the Rocketman in the future. The Rocketman concept was first revealed in 2011 as a tiny 3.2-metre-long…