iMore is reporting that Apple will release its next-gen iPhone in August. Obviously, the device will be stronger, better, faster, and so on, but the real takeaway is the timing. For years, iPhone releases were as predictable as the tides, coming every June. But the iPhone 4S came in October, the iPhone 5 in September, and now the iPhone 5S (potentially) in August. So much for routine.
Apple showed its willingness to change things up when it dropped an iPad Mini and a new iPad last fall, just after the release of the iPhone 5. But the increasing unpredictability of iPhone releases has the twin benefits of allowing Apple to respond more quickly to Android challengers like the upcoming Galaxy S IV, and to make it harder for people to hold off on buying older models (which causes major damage to Apple's bottom line) in anticipation of what's coming next.