The Photoshop illuminati have been busy dreaming up future high-performance variants of the 2012 Audi A6. This particular rendering, from ELD Design, shows what a possible RS6 would look like.
http://www.youtube.com/v/vI3VQ1wJAmg?fs=1&hl=en_US&rel=0
WorldCarFans (http://feeds.worldcarfans.com/~r/worldcarfans/Jxfz/~3/YRV5O3Td7RI/2014-audi-rs6-rendered-videos)
You can also check the back views out!
http://www.youtube.com/v/B0-Ob5isQU8?fs=1&hl=en_US&rel=0