Yeah, I'm in this Oct 1 to 6 boat. It took an hour of screwing around for me to finally get an order through at Apple at about 3 AM Central, and then only on the Apple Store iOS app. What really pissed me off was that the app said 9/19 delivery when I checked out, but my email confirmation says 10/1 - 10/6. Dumb.
I ordered an iPhone 6 Plus, 64 GB, Space Gray, AT&T.
We all heard the rumors about potential contraints / delays of the larger iPhone model this time around, so even though they went up for preorder the same day as the 4.7" models, there are probably fewer 5.5"s to go around. So I'm not holding out much hope that my delivery date will be moved up. Never know, I guess. But as of a few minutes ago, my order status on apple.com still shows 10/1 - 10/6.
This'll be the first time I haven't gotten an iPhone on release day since the 16 GB iPhone classic in 2008, feh.
The good news (for me) was, it was very clear in both the app and my email confirmation that my AT&T grandfathered unlimited data and texting plans were coming right over, no issues. That really surprised me. AT&T frakked that up when the iPhone 5 launched and I had to call them to get it resolved.