If your incredulity is due to it being a wagon, wagon is the only configuration for this generation RS6.
If however your incredulity is due to their choosing the RS6 instead of the RS5, TT-RS, R8, then... yeah... yeah I don't know why they did that. The R8 would've been the obvious choice.
Can I just say how great it is to have our car in this grouping, though? Dollar for dollar I can't think of more fun on 4 wheels.