The three tracks include the Grand Prix course, the Nordschleife and the 24 Hours course. In fact visit the latter this weekend and play GT5!
A special demo booth for Gran Turismo 5 will be present at this weekend's 24 Hours race, which will let you try out all three Nurburgring courses. The reveal was made by the official, complete with screenshots.
"Players will be able to test their skills on these challenging courses, literal testing and proving grounds for the world's best cars, recreated in stunning detail as only Gran Turismo can deliver," wrote the GT5 development team.
Gran Turismo 5 releases exclusively on PS3 sometime this year - hopefully.