Audi's having a spot of trouble keeping a lid on things ahead of the 2008 Detroit Auto Show. First the TT-S photos were leaked to Spanish website Motorpasion, and today we see video of the R8 V12 TDI concept has been posted on a Russian site. The Detroit-bound car is said to make 500 horsepower and 737 lb-ft (1000 Nm) of torque while boasting fuel economy of over 23 US mpg (10 liters per 100 km). Zero-to-sixty reportedly takes 4.2 seconds and the car should have a top end of 300 km/h, or around 186 mph. Want one? According to Auto Tuning News, a production version is likely in mid-2009. Save those pennies, kids. Detroit's just days away, and we'll get the full story on the TDI R8 as soon as Audi releases the goods. In the meantime, check out the video (it's all studio stuff with the car static against a plain backdrop) after the jump. Thanks for the tip, Oldenburger!

[Sources: Auto Tuning News, YouTube]