Thanks for the tip, Zerin!
In a world full of AMG and M models, Audi can't be satisfied with fielding only the 436-hp, V10-powered S6. That's why it's working on returning the RS6 to the lineup. The new RS6 was caught by Brenda Priddy's spies doing laps on the Nurburgring in Germany. Wearing a migrane-inducing camo pattern, the RS6 is distinguished by fenders that push out wider to handle larger wheels and a rear diffuser that houses a pair of oval tailpipes. As the linked article indicates, while the S model sports four round tips, RS models stand out with these oval pipes. There was no mention of what may power the RS6, though it needs to be pretty hot motor to best the detuned V10 from the Lamborghini Gallardo that powers the S6. We've heard rumors of a twin-turbo version of the V10 producing between 500 and 550 horsepower, though other mills are being considered, too.