Don't despair yet! I got that same email hours after the initial pick-up time they had promised...and at just about the same moment they charged my card and I started being able to track the FedEx shipment to the store.
I can't for the life of me figure out how they are able to botch this up so badly, it apparently has something to do with miscommunication between a chainwide website and regional distribution centers, but it is something they need to streamline out of their system if they are going to persist in the online preorder model.
Not that the brick-and-mortar model of exclusive distribution has been great for the past 20 years, either, but at least they didn't yank your purchase out of your cart at checkout and sell it to the guy in line ahead of you...