The credible sources said that Apple is preparing "iPhone 5s Mark II" of which specification of the chip is changed to A8 chip, 802.11ac Wi‑Fi, Bluetooth 4.1, FaceTime HD camera is changed to higher quality ƒ/2.2 aperture based on iPod touch (6th generation) as an improved version "iPhone 5s" that mounts A7 chip.
The site's sources say that the device is ready for production and it can be shipped anytime.
Previous rumors have suggested that Apple could ship a 4-inch iPhone 6c in mid-2016. We'll let you know if we hear anything else. Please follow iClarified on Twitter, Facebook, Google+, or RSS for updates.