In what is turning out to be one of the most protracted teaser campaigns for a new car model, Toyota has confirmed that the forthcoming A90 Supra set to make its debut at the Goodwood Festival of Speed later this month will, in fact, be powered by an inline-six engine driving the rear wheels, staying faithful to the driveline layout of Supras past, all but confirming the 3.0 litre capacity shared with the upcoming BMW Z4.

The teaser provides us with the clearest glimpse of the roadgoing model yet, which comes after the GR Supra Racing Concept that was unveiled in March this year. Spy images of development vehicles have hitherto provided the best view of the road car, shorn of its racing equipment and bodywork.

The Supra will do without a manual gearbox option, instead rumoured to use an eight-speed automatic transmission. Although birthed from a joint project with the German automaker, the Supra will be ‘very different’ from the Z4 it is being developed with, said Supra chief engineer Tetsuya Tada.

Tada will be one of two drivers who will drive the new Supra up the hill at Goodwood, the other being master driver Herwig Daenens. The prototype model will wear a camouflage livery in Gazoo Racing colours of red and white, and will also take on display duty alongside the GR Supra Racing Concept.

GALLERY: Toyota GR Supra Racing Concept