lol it will hardly look dated ... but I can see how somebody wanting to buy a new RS3 when the A/S3 facelift is out would rightly want the facelift.
I think what is becoming clear is that there will be a lag between the new A3 & S3 being released and the RS3 which is likely to be months later or even next year.
If the RS3 facelift was imminent, Audi would have mentioned it along with all the offical facelift news this week, but its all about the A3 & S3.
I do think we will see the TTRS now before the facelift RS3 as was mentioned by Foxtrot - extra power hike, lighter engine block, revised gearbox etc etc, it could all stack up. Let the TTRS have the glory first and then let the new revisions filter into the RS3.
& that way Audi will get a shed load of sales for the A3's & S3's initially and then get a surge for RS3's when they are released again down the line.