IPhone 6 price after 6s launch?

Since the new iPhone 7 (6s) is coming in September, when will the price drop happen for previous models (specifically iPhone 6)? Is it most likely to happen immediately after the launch (IIm talking about that day/week/month) or after some time (a few months/year). How has it been with the price drop after new iPhone launches so far?

No one here can predict the future.

Although I like what I read about the new A9 chip, that may be a big leap ahead in performance.

Probably a hundred bucks. Maybe from 800 to around 650. If you wait 6 -12 months later, maybe around 550-700. Of course, i can't give you a perfect price decrease ration, so those numbers are my guesses.

Now, keep in mind that these prices used are according to t-mobiles price. That's the carrier that i have, but in short, over 6 months or more, the price will drop down by 50 to 100 dollars. And it will keep dropping as time goes on.