Again, this is due to what I said in another thread so I'll just copy-paste again here:
"Assuming Verizon has 2-3 million pre-orders, all this means to me is that they are at full capacity for shipping each day. Their warehouse of people can only ship so many devices in one day. Maybe it's a hundred thousand, maybe a million, but there is still a limit to how many orders a team of humans can check, pack, box, label, and ship within a 24 hour period.
I'm fairly certain everyone who pre-ordered on Verizon will be getting a phone from the same batch. But again, a team of humans in a warehouse is still limited to how many they can ship in a day, which is why I think everyone is getting ship dates of 9th, 10th, and now the 11th."