Should i buy the iPhone 5 or wait for the iPhone 5s/6?

I have a 4s right now, and we're switching to at&t. This means i get to upgrade my phone. I will be going to school august 14th, and up until then i will be distracted with other things and usually the new iPhone comes out in mid september but i wouldn't mind waiting. I just don't know if t will come out. Then i will have waited for nothing. What should i do?

Added (1). I'm only interested in ana iPhone so please do not suggest other phones.

Hold on to your iPhone 4S and wait for the Iphone 5S in September!

A new iphone might be brought out along with iOS 7.

I'm waiting for the next iphone, I'm due for an upgrade but in no hurry, so probably in a few months I'll upgrade when that comes out. However 5 is a great price right now, some are offering $99 on 2 year contract.

If it was me, I would wait for both the new iPhone and the new iOS 7

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