The thing is that most of the S/RS models often come at the end of the model run. So the RS4 is on the B8's last legs the moment its out.

But with the R400, it's still pretty early in the cycle. They could of course make it a special edition but if they are really smart about it, they could come out with a mid-cycle facelift and introduce the new engine (maybe detuned slightly) for MY16 as an across the board change for the Rs. Pricing wise, it's a bit of a squeeze now, not just in Australia but also in Europe, with Mercedes putting downward pressure on all the other makes with their keenly priced A45s, so I am not sure if there is enough breathing space to price the R400 competitively.