VIDEO: Mystery Audi Sedan Prototype Caught on Tape, is it the 2011 A8 or the New A6?

Audi has us all confused lately with its 2011 A6 and A8 test cars as it's very difficult to tell one car from the other with certainty. For example, check out this video shot in Mexico that shows a somewhat lightly camouflaged Audi test mule on the road. Now, can you tell us if what we're looking at here is a prototype for the new-generation A8 that will be unveiled at the end of the month or for the redesigned A6 which is slated to be introduced next year? Hit the jump to watch the video.

Via: Worldcarfans