This is actually the first time I'm considering waiting things out. I'm pretty decided on getting either the Verizon or SIM-free version (full price, no contract) so unless they offer either model for online pre-order without requiring a 2-year contract I'm gonna hold off on the purchase.
Mind, aside from the nightmare that was last year, staying awake until 1AM (Pacific) on pre-order day has worked quite well for me. I've gotten a 3GS, 4, 4S, 5 and 5s upon release that way. Even the 6, I could have gotten upon release despite Apple's server issues. It was just the 6+ that was in super short supply.