On the contrary, the pre-order reserves our spot in line, it says so on the slip they all gave us when we put our pre-order down. Which means whichever systems come in first, we will be the first to be given the opportunity to buy them. This will be so until all pre-orders are filled. Then afterwards, those who did not pre-order will be allowed a chance to buy them.The only function of a preorder is that it gives corporate a ballpark amount of how many units to ship to a certain store. This doesn't guarantee that your preorder won't become someone else's launch day purchase.
The only thing not guaranteed to us is that we may not exactly receive it on the launch date, in the case that they do not receive enough to fill the pre-order quota.