Motor Trend has reported that Audi plans to add diesel and hybrid Q7s to the U.S. market some time next year. Not a lot of detail was given but Audi is planning on using engines that were developed by Volkswagen and Porsche.
Here's a quick snippet from MotorTrend.com:
The parallel hybrid drivetrain - meaning that the car can run on gasoline or electric power only, as well as on both engines - consists of the 280 horsepower 3.6-liter direct injected V-6 that is standard on the Q7 and an electric motor with a nickel metal hydride battery pack. According to Audi powetrain electronics head Josef Bast, the hybrid Q7 uses about 23 percent less fuel than a similar gasoline-only Q7.
Audi also plans to bring over the 3.0-liter diesel V-6 that makes 230 horsepower and 400 lb-ft of torque. The model is expected to have a range of about 600 miles.
Source: Audi to introduce diesel and hybrid Q7 in 2008, says report