Some guy accidentally shot some pics in Germany. Not the final S4 exterior but brakes and back point to it being one.

• from Motor-Talk.de (German, registration required)

_{2004 A4 3.0Q Tip Avant Ultra Sport, Moro, Premium, Cold Weather, Bose, XM, OEM Bluetooth, Color DIS}
^{RNS-E, Audi iPod with XM}