Improved Front-Facing Camera
The new iPhones are also expected to have new front-facing cameras with a larger sensor than the 1.2MP FaceTime cameras currently found on the iPhone 6s and iPhone 6s Plus.
In addition, the FaceTime camera is expected to feature a front-facing flash. This, and the improvement to the sensor, should mean better looking selfies (particularly in low-light) and better looking video chats. Your co-workers will never have looked so good.