Porsche’s plans for hybrid road vehicles are nothing new—the company plans to introduce a hybrid Cayenne SUV in the truck’s next generation, as well as a hybrid version of its Panamera sedan—but at the Geneva auto show, the German sports-car king will introduce a hybrid race car based on its 911 GT3 R. It’s no mere concept, either. Following its debut, the car will head to the Nürburgring, where