I know for a fact by looking up when my 42MM SS BSB was made in the week of April 15th, that crazy close to a release date. They must of had some type of production issues or something wrong with the company who was previously manufacturing them.
Mine shipped out this morning with a expected delivery of the 27th, I am in the states in Kentucky. I preordered around 12:03am PST, but I called Apple to confirm my time. The time I was told was 00:03:27 so I don't if thats any help. I was charged last night as well.
Maybe there was some flaws in the models they made, I don't know. I definetely know that we will have a better and more subperb model then probably the reviewers and such if they shifted companies so quickly.
I was under the impression that Apple began production in January, so I don't know why my serial number on my watch recognizes as the week of April 15th.