240PS Bi Turbo GTD with 4Motion.
Also just noticed the Octavia VRS 184 is now available in 4WD. Not fair 
My previous A3 was the 170 bhp unit and Quattro and you can specify the Quattro on the 184 bhp and soon to be 190 bhp units.
So its always been possible to do, but if they do that for the GTD, they would have to option it for the GTI and both would dilute the appeal of the R with the increased traction and economy of GTD/GTI with 4WD.
Unless they produce the car mentioned above, a GTD - R with significant raise in bhp and market as an additional model to the GTD then doubt ever happens.
Its easy to market in the A3 as the only model that stands apart is the S3 you bolt together anything else you want, where as VW have 3 distinct performance Gold bands and they would not want to damage one with raising another.
If it was available then would definitely be top of my list with the economy/performance balance
my 1-2-3 for next car all have 4WD its the only thing missed from moving from A3 to GTD
1. DBP Golf R
2. A3 Sportback 190 BHP Quattro (facelift)
3. S3