Watch the 2015 Audi S8 debut at the Detroit Auto Show

( ) The Audi S8 rocked the luxury car world upon its launch for the 2013 model year -- how could a car so long, so luxurious, and so spacious achieve the 3.5 second 0-60 time and razor-sharp handling it achieved? Few luxury sedans can rival the S8, thanks to the magic of Audi’s engineers. However, those Audi engineers have been hard at work, as the S8 and its A8 counterpart saw a refresh for 2015 at this year’s 2014 North American International Auto Show. The changes to the S8/