Rough translation of the German Text:
The clean Diesel will be introduced in the US at the beginning of 2009, and will later also be offered in Europe. Audi didn't announce pricing yet. Customers in Germany will be able to order the clean Diesel option once available (i.e. it will not be standard in Germany).
The Q7 V6 TDI produces 225 HP and 550 Nm (407 lbft). 0 - 62 mph will be reached in 8.5 seconds. Audi claims a 216 km/h (134 mph) top speed. Fuel consumption is 9.8 Liter/100 km (about 21 mpg) and CO2 emissions are 260 g/km.
Urea injection reduces NOx (similar to the Mercedes-Benz BlueTec)