Well, I can't say I saw something that said 'first come first served' and if they did say that, it means 'first to try to pre-order gets a preorder' you've reserved a device and will get it before the 10th.
Also keep in mind what I am saying. Your order is technically 'shipped' as in it's packaged and ready to be picked up by the carrier. Because you may be local (or more local) to the warehouse, your order doesn't have to be picked up yet so no tracking info.
Given distance and weather factors, Verizon/Fedex/UPS may pick up some orders earlier so they get there on time. So the order going from PA to NJ has to be picked up on Monday, but the order that travels farther, say PA to Maine, has to be picked up today. but everyone gets their orders around the same time.
Now if they actually go "Out for Delivery" and reach people by Monday, then oh well. You can be pissed then