@Silverclay
This happens all the time. There are dozens and dozens of reasons why and how it could have happened. Stock was not received yet, inability to ship the item, computer inventory errors, etc etc.
I have ALWAYS received something that went to backorder. Can't say 100% you will, but in my experience within a couple days it has gone into processing. You ordered b4 it went on air, so you should be at the top of the list.
I am not always so lucky with waitlist and sometimes it gets cancelled, but I have had good luck with backorders.
If you really want it, be patient and do not cancel the order. Wait to see how it plays out.