That's the problem with so many different flavors, I suppose. One week, a production run of Stealths, the next .375 safaris, the next push feed WSSMs, etc. Still, there should be some in the pipeline unless you ordered a very exotic or limited production rifle.
Something is a bit aromatic here. I would be inclined to ask a) if alternate suppliers have them in stock, and b) for a copy of the order acknowledgment from the supplier. Better yet, check with other suppliers, round up a couple options, and tell your supplier he has 14 days to produce or refund your dough.
If nobody else has them, Winchester may have taken a page from the Ruger book and isn't going to build them until the hype machine has generated the orders.