In Sports Car International...

"Small scale production of the R8 V12 TDI should commence in 2010-but not before the release of the 4.2-liter R8 V8 TDI aimed to produce 360 horsepower and over 550 lb-ft of torque"

http://www.sci-mag.com/art2/art2p1.html

Great road test and review.