Something big needs to happen with the next iPhone. If they're seriously contemplating launching another S series device instead of a new redesigned phone with some legitimate new reasons to buy the hardware, they better make iOS 7 worth my, and the rest of consumer's, time.
I doubt either of those are going to happen and the growing quality of Android and the devices that are beginning to launch with a hardware quality just as high as Apple's (my friends Droid Razr Maxx HD is one of the most solid phones I've ever held and I won't even get started with the quality of the HTC One as a piece of hardware), it's going to be hard to keep my interest with another iPhone. Yeah I have a Mac and yes I use iTunes and that ecosystem, but that's almost irrelevant at this point. Integration is no longer an issue with apps like Doubletwist, the focus on the cloud, etc. Apple needs to do something big. An iterative update to a phone that was already proceeded by a phone nobody really wanted an iterative update to wouldn't be a good idea in my opinion.
TL;DR - Apple needs to stop resting on its laurels and launch a brand new phone with some truly new and interesting hardware or make iOS 7 a real powerhouse to compete with how excellent the newer builds of Android have become.