Audi has unveiled its new A5 and S5 but engineers are hard at work developing the high-performance RS 5 model, a prototype for which has just been spotted.

The prototype may look like one of the many testers we saw for the S5, but if you look a little closer you’ll notice the slightly pumped fenders to accommodate a wider track. Some larger intakes have also been carved into the front and at the rear are signature RS oval-shaped exhaust tips.

While the outgoing RS 5 sports a naturally-aspirated 4.2-liter V-8, the new model is expected to downsize to the new twin-turbocharged 2.9-liter V-6 that debuted in the 2017 Porsche Panamera 4S.

In the Porsche sedan the engine delivers 440 horsepower but in the new RS 5 the output should be dialed up beyond the 450 hp of the outgoing model. We hear it may reach close to 500 hp to challenge the 503 hp of Mercedes-AMG's C63 S Coupe. All-wheel drive will be standard and the transmission could end up being an 8-speed automatic shared with the S5.

Thanks to the use of the Volkswagen Group’s latest MLB platform, look for the new RS 5 to weigh significantly less than its 3,800-pound predecessor. This should help improve upon the outgoing car’s 0-60 mph time of 4.5 seconds.

We’re expecting a reveal of the new RS 5 sometime in 2017. Sales in the United States aren’t expected to commence until the following year, though, so we’ll likely see the car arrive as a 2019 model. In addition to the coupe, there will be another RS 5 Cabriolet and this time around we should also see an RS 5 version of the U.S.-bound A5 Sportback.