The new model is above the existing third-generation X5. The concept is called the Concept X7 iPerformance. Revealed on Tuesday at the Frankfurt motor show, the new six-seat SUV presages a planned production version of the X7 due to reach showrooms in late 2018. It will offer the choice of traditional petrol and diesel and, as showcased by the new BMW concept, a plug-in petrol-electric hybrid driveline with a zero-emission range of up to 62 miles.