Sorry to double post, another update which might help answer why all the build week 30 orders have jumped forward.
From VW live chat:
'Thanks for waiting. I have some clarification now. The car has been built and it left the factory today, en route to the German Port of Exit. The reason is that it has been built early. Originally it was scheduled to be built during week 30, but it was built early due to a factory closure.'
Fair play to the guy I spoke to he couldn't get any joy on the phone, so physically went two floors down to get some clarification in person.

Whether this means the cars will sit in Germany til the original planned shipping date, or it ships sooner, I'm not certain, as he didn't have any more info on that.