iPhone 4 launch day is right around the corner, and that’s probably where the lines will be as well. This version of the iPhone is by far the largest leap in terms of hardware changes since the original iPhone, and that has people excited. With iOS 4 having been released this week as well, it’s kind of hard not to be. The question remains, though, as to what is going to happen this Thursday when the doors at Apple and AT&T stores worldwide open.

Despite being extremely unprepared for the high demand of pre-orders, Apple has announced that they sold out of the 600,000 pre-orders they have available. They also added, “It was the largest number of pre-orders Apple has ever taken in a single day and was far higher than we anticipated, resulting in many order and approval system malfunctions.” You can say that again. This is 10x the number of 3GS pre-orders for AT&T.