Silly question: why would you want to get the iPhone 5 right away? If history has shown us anything, it's that new hardware may have issues. So why not wait a few months until the craze dies down, and the hardware bugs are worked out?
I don't necessarily need to, but my current phone is going on 3+ years old so I had been waiting for the iPhone 5 to come out to get that one instead of getting the 4s. I think just about everyone will be in the same boat with the operating system upgrade that comes out next week.