The more I think about it, the more it makes sense to me that the network issues the last two days are the only cause of the delay.
Think about it. In the beginning of the week there was a mad rush by Verizon to get stores stocked up and caught up. If you noticed, on all of the leaked documents that were detailing shipping/inventory/storage prep, it mentioned that the phones were being shipped to stores by a special process, employees had to inventory them in a different way, everything about the way they got the phones into stores was done in a rush as opposed to normal.
My gut is telling me that they want this phone out just as quick as we want to buy it. Every weekend that goes by is another holiday sales weekend missed. And when the network issues and SIM authentication issues started coming up, they, in an emergency like response, killed the Friday launch. I'm assuming that in the areas where 4G was down, they wouldn't even be able to activate it on the network, or they would have to give you a brand new 4G phone saying "Well, 4G doesn't work...but enjoy it!"
Network is back up this morning. 24 hours of testing/waiting to make sure everything is fixed could put us at tomorrow still, but more realistically they will wait the weekend out to make sure things are straightened out.
No other scenario makes any sense to me. Lack of GW support makes no sense (see my previous post). The phone is obviously ready for prime time as it's been shipped and the OTA everyone is getting upon booting up is final. Employees have been trained. Everything is set to go. EXCEPT for their own 4G network...