Unless dealers have already placed orders for "stock" i can't see how anyone would get one delivered before Christmas. I don't think performance golf's are ordered as stock normally. The only thing you get quickly is where they sell off demo cars (not likely yet) or manage to reassign a cancelled order in the system (again, not yet).
On the other thread someone already said they had ordered and are quoted fourteen weeks, which is end of January.
I can't believe there won't be stock of mk8 GTIs available between now and Christmas. I noticed the person on the other thread had been quoted 14 weeks, but we don't know if that is a standard car or with options.
I also recall my conversation with a certain VW Dealer when I wanted a GTI, "oh no sir VW don't have stock they will all be build to order"...........So when he called me a week later to ask if I had decided, he was shocked when I told him I had spoken to another dealer and my new car would be available in a week.
(I had gone to the another dealer, who said right " we have 14 cars available in UK, what colour would you like")
When I got my Golf R it was at Emden but had not been allocated to any dealer at that stage. So I think they generally try and keep a level of stock.
I know its a new car, but they have started to build them so there must be stock slowly coming into the system.