MacRumors has received pictures of what appears to be an iPhone 5S and it seems that the device features a dual-LED flash and a larger battery.
Overall the iPhone 5S looks very much like its predecessor and appears to be a simple update.
The difference between the two devices could be the location of the Flash positioned on the back panel as the iPhone 5S seems to feature a dual LED flash.
The battery is also different. It has a capacity of 5.92 Wh battery while the iPhone 5 battery has a capacity of 5.45 Wh.
Also, the processor of the phone is not labeled A6, as is the case for the current generation.
The date code 1243, visible on the bottom of the main chip, suggests that the handset was assembled in the 43rd week of the year 2012.
The iPhone 5S is expected for release in the month of September or early October, accompanied by a cheaper model.