Visitors from all corners of the world flock to Detroit to check out the latest models and trends set to take off in the coming year. 2013 promises its fair share of world premieres and new ideas. It's not just about American manufacturers showcasing on home ground, though; major German carmakers are also keen to impress. Mercedes, Audi, Volkswagen and Porsche are all represented at the show. Drive It! takes a look around.