Since totally new A3 will be introduced in Geneva your suggestion do make sense.
Just... According to my info new RS3 with 360ps(or more since new 7 speed S tronic can cope with more power and torque) is not yet approved by Audi turst of minds. Basically, car is ready in prototyp form but, we need to see if it will see the green light. New S3(more then 270ps!) will be also very interesting product.
BTW, why 360ps in TT RS? New Boxster S/Cayman S is the answer. Audi wanted to be faster then competition-at least for sure in straight line. Also, 360ps TT RS with right options will be much cheaper then forthcoming Cayman S with similar options. Of course, new Cayman S will be a benchmark, track wise for sure.