Probably because 2 year contracts, and they don't feel like selling their phone because the trend is that the iPhone 5 isn't that big of an upgrade. Which I don't agree with! As for why I'm not getting the iPhone 5 is because my contract started a few months ago T-T (but luckily I have a yearly contract), and I don't want to sell my 4s because I have this problem where I like to hoard all past phones. -_-
Um...that's not necessarily true. I know that at least AT&T doesn't update their order status like Apple does. Every year people that get up in the AM and have order confirmations from AT&T post here complaining that they didn't get their phone on iDay. Most that ordered in the AM would presumably NOT get their phone next Friday.