The order book for the GTI (with VW) was only open from April as far as I'm aware. So if you placed an order with your dealer prior to this date, all you are doing is (hopefully) getting first dibs on that dealers allocation slot. To be processed when VW start taking orders.
As I understand it, at present there is an issue with the assembly process. All orders for GTI's have been 'parked' until this is resolved. No GTI has a valid build date at present. Once this is resolved, they will be processed, manufactured and delivered in date order, no matter what the specification. (As the only spec related delay was the DSG which is now not an issue).