So iPhone 7 will be announced next week, and released some time after that. Currently I'm on o2 refresh, which means I can pay off the device plan and upgrade. Currently the device plan is £350, and I can trade my 6s 64gb in for £370-390. Question is, do I make this decision before the 7 is announced or wait? I'm not sure how the value of the 6s will be affected post 7 annoucement. Anyone considering similar move?