Rear camera on Apple iPhone 6s said to employ 12MP Sony RGBW sensor
Additionally, there will be a small but significant change with this sensor that will allow the camera to be better equipped to produce quality images under low-light conditions. The addition of a white sub-pixel, making it a RGBW sensor, allows for improved camera performance when lighting is not optimal. There is also talk that the autofocus speed will be faster, perhaps with the use of phase detection.
Lastly, this report also pretty much puts the kibosh on the dual camera set up that some had claimed would be found on the next iPhone. Apple has been allegedly testing the camera for over a year to make sure that it is free of bugs and ready to be deployed. We could see the Apple iPhone 6s unveiled as early as August.
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source: Feng.com (translated) via GforGames