Well i have a 2004 S4 Avant on order... I don't particularly care for the RS6, too expensive, i would rather have a new Merc E55 AMG or S55 Amg.
As far as the RS4, the details are still sketchy, ppl are saying twin turbo V6, but i think if they could squeeze a RS6 twin turbo V8 in there, add a...