According to german Automotive newssite Automobilwoche an Audi spokesman announced the debut of the new A6 allroad on the Geneva autoshow (2-12 March 2006) and the market introduction in summer 2006. No further details to engine lineup and pricing.
I don't think that the dark bodywork seen in this pic is serial trim -> look at the back door.
Notice the new roof railing, which is silver on the inside (camouflage on the outside?)
Greets
Seb.