Según bimmertoday, no seria el i8 S, sino el safetycar de la Formula E
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http://www.bimmertoday.de/2016/08/02/bmw-i8-s-performance-prototyp-safety-car-formel-e/

Han pillado rodando lo que parece la versión mas deportiva del BMW i8, un coupe hibrido con motor tricilindro + electrico.
En las nuevas espias se ven detalles que hacen sospechar que se trata de un prototipo con un motor (o conjunto hibrido mas potente) mas gordo o mas potente, como los frenos mayores, llanta grande, mas salidas de refrigeración (el cristal trasero)…

http://www.motor.es/noticias/2017-bmw-i8-s-201628117.html

p.d.: me es imposible encontrar el hilo del i8 original, asi que hilo nuevo en seguimientos