You're always going to be waiting for the next iPhone. If you have the money then get it.
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Yeah i'm a firm believer in this. If you wait, you will constantly be living in a perpetual state of "WHAT IF...?"
OP, what if the 6s+ has got Force Touch, but what if the 7 has three gigs of RAM but what if the 8 has a removable SD card and battery but what if... what if...
If you want to wait for September then wait. Personally, I would only wait if I was a couple of months off and I could afford to wait (I mean that my current phone was working fine).
Last year I had to upgrade two months before the 6 came out because my 5 got water damaged and I was using a Galaxy Note 3 that was the worst piece of junk I had ever had the misfortune to use. Because of that, I lost out on work. I needed a reliable phone, so I bought a 5s.
If you have a reliable phone now, ask yourself this. Do you like it? If so, why are you upgrading at all?