If you recall, VW, owned by the same company as Audi was one of the first automakers to offer iPod integration in their cars as an optional feature. But accessing your music is one thing. Offering a hands-free option to answer your calls seems like a great feature to have. The picture, provided by HTLounge makes the interface look pretty cool too.
Source: http://www.iphonematters.com/article/audi_introduces_apple_iphone_integration_in_their_cars_421/#When:10:00:01Z