Here we go again...
It depends on your needs. Do you need one now? Probably not since you are considering waiting. However, are you willing to "suffer" the 3 month wait (even longer if you have to wait weeks for shipping when ordering online) just to get a phone that will most likely contain faster internals, a better camera, and possibly some new exclusive feature?
I'm in the exact same situation as you. I am going to buy an iPhone 5 (potentially today! Look out for a sig. change 😀) because I want to have a smartphone (as opposed to a dumbphone) when I start university this September and I don't want to wait weeks till it is released and then weeks more for it to ship to me. Also, this week I'm leaving for a trip to Europe and would like to replace my dying, laggy iPod touch.
If you can walt, you'll have a better iPhone, depending on whether or not it matters to you.