Recently, foreign media sources said that Apple will host two new iphone launch next year, in the spring is a generation of the iphone 6s, and the traditional autumn is the iphone 7. While this may seem to be somewhat unacceptable, it has been explained by the foreign media.
Foreign media stableytimes reports that Apple has been doing so to shorten the iphone's release cycle, and to keep up with the more frequent launch of new machines by competitors. On the other hand, the iphone will be used to boost sales next spring when Apple Watch is on the market.
Because if Apple Watch alone, I'm afraid many users will choose to delay to the next generation of iphone to buy, so Apple is likely to put the iphone 6s early to spring, and Apple Watch with sales, autumn only launched a real replacement iphone 7.
When it comes to the new iphone 6s, it has been reported that the next generation of iphones may be using a dual-lens system called "Two-lens system", which is designed to match the quality of the proofs taken by the handset to the SLR.