2015 Audi A8, A8L and S8 unveiled ahead of Frankfurt Motor Show debut | Autoweek
More details will come closer to launch in 2015, but for now it looks like Audi will offer the A8 in the U.S. with the supercharged 3.0-liter TFSI V6 (310 hp), the twin-turbo 4.0 TFSI V8 (435 hp), the 3.0 TDI clean diesel (258 hp) and the 6.3-liter W12 (5...