Unless I’m completely mistaken, the 1TB upgrade was only on sale for a short period as the order for the drives couldn’t be placed until the exact quantity needed was known (and paid for). I would sincerely hope that the drives have been ordered and are now simply awaiting shipment/delivery.
I would think that the best case for those who missed out would be, as @netkid23 said, to email the team. It could be that they take your V out of the main manufacturing queue, order you a 1TB drive and fit it once it arrives. That is, of course, a considerable amount of work for them and might mean you would have to pay more for the drive.
It would also almost certainly create a further delay to the delivery of your V. But you may well thinks that’s worth it for the increase in capacity.