According to Evan Blass (aka @evleaks) who has a pretty good reputation on information leak for mobile devices the iPhone 7 is set to release during the weekteamwhich starts on September 12. 
This coincides with earlier rumors that wanted the device to be released early in mid-September.
Historically, Apple has kept a rather tight release schedule for so many years. Usually S versions improve on the previous main version offering little news characteristics.
This year, the upcoming release could look like a simple "S" update as a bigger update is planned for the 10th anniversary of the iPhone next year.
Patience for all interested and we will see… It will be really interesting to see how the sales of this model will go, when there is the promising for a super iPhone in 2017.
