IF you pre-ordered online from Microsoft Store, and used PayPal as your payment method, I'd suggest you check the Payment Status on your PayPal account on the day you placed your pre-order.
I just happened to check mine, and noticed that my Payment Status was set to Expired.
This made sense to me, as the order had been placed months ago, but MSFT hadn't yet requested the money. As such, a contact PayPal for confirmation that the payment would still be made if Microsoft were to request the money now. Unfortunately, PayPal said that any requests now for the funds involved in that transaction would be refused as it had Expired.
I've now therefore had to go back to Microsoft Store (by phone), cancelling my original pre-order and getting them to place another order. When doing this i made sure, and was assured, that my priority for the Xbox One Day One Edition with FIFA 14 would be kept.
So, It looks like the "Expired" card emails sent out on Monday might not have been in error at all, especially as Aperture o got the same "expired card" email and placed his/her order with PayPal payment.
So, if you pre-ordered using PayPal for payment, I urge you to check this! Especially as you know only have two days before Microsoft start processing orders.
Mine is listed at BackOrdered, but the status on the left hand side says "Order In Process". If my console is backordered, I will flip out because I ordered mine on June 10th. If anyone ordered before me, I will be surprised.
Microsoft goods are always listed as "backordered" when they're pre-order items. Don't worry about it.
Also, just noticed that my replacement Order is now listed as "In Process" in the main area (as opposed to "BackOrdered" on the original) AND on the left