Talk of R models is just VW's way of spoiling sales of Fords, Hondas, Renaults, Vauxhalls during the long period they have no hot hatch on sale. Personally, with the new platform just a year or so away, I don't even see a MK6 regular GTI appearing.
A smokescreen that appears to be working.
With respect I don't know where you get your info from but it is all incorrect! There WILL be a GTi in the Mk6 (it's already on the VW website?!) and an .:R model will follow in 2010.
Oh and long period without a hot hatch??? VW have Mk5's sitting on runways around the globe and the Mk6 GTi is out in June. So that long period will be nil as they will overlap!
The new platform will be used firstly on the new A3 when it's launched.