According to Digitimes, the next generation of iPhones — probably to be dubbed the iPhone 7 — will ship at the end of September. (The fanciful iPhone mock-up in this article are courtesy of Web Design Co.)
The article says the new 4.7-inch iPhone will be handled by Pegatron Technology and Foxconn Electronics (Hon Hai Precision Industry), while the new 5.5-inch model will be made by Wistron and Foxconn.
Chances that the rumor is true (IMHO) opinion: 100%. After all, to date that’s been the time frame when Apple always releases new smartphone.