The next iPhone will run much faster on a 2.4 Ghz A10 processor and be available in two new darker color options. It will also be waterproof with an IPX7 rating.
http://www.notebookcheck.net/Apple-iPhone-7-6-SE-Ming-Chu-Kuo-leaked-last-minute-information-about-the-next-iPhone.173372.0.html
"KGI Securities forecasts a total of 60 to 65 sold units by the end of this year". The end is nigh ;D
It will sell less purely because everyone knows 2017 iPhone will see a major redesign.