That sucks, WD, but you're not alone.
Two of my friends work at GS and this is a problem across the board. GS dropped the ball on this bigtime by leading people to believe that they would have enough on launch day for everyone who pre-ordered it.
I'd suggest you go to bestbuy/walmart on opening day and see if you can't get one. They aren't doing reserves (well, bestbuy isn't anyways), it's first come first serve. So try and buy one from one of those stores and then go to GS and get your preorder money back.
It's crap like this that keeps me from preordering ANYTHING.
This is going to hurt GS big time, I think. People are going to be very hesitant to preorder anything for a long time.