Here is a render from www.theophiluschin.com that Autozeitung used: http://www.autozeitung.de/auto-neuheiten/audi-rs-3-2013-bmw-m135i-mercedes-a-klasse-25-amg
Horrible render. Just horrible. They know better to take the A3 and render it with RS Q3 and give it the A1 Quattro wheels.
I really dig that rim design, but it constantly reminds me of the rims that the Renault Clio Williams came with in the early 90s and the aero rims of the E34 M5...
I'm less interested in how it will look at the moment, rather know how soon it will be out but if the estimations are right about the RS6 then will might see an RS3 well before facelift this time.
I'm of the opinion that all RS Audis should use the same wheel arch design for all of it's models, keep the theme consistent.