Earlier this year, Foxconn's assembly plant in Zhengzhou went on what was characterized as a "hiring spree" to prepare for the next versions of the Apple iPhone and Apple iPad. The nApple iPhone 5S is believed to include a faster processor, improved 13MP rear camera with dual LED flash, longer lasting battery, and a fingerprint scanner. The latter, which has been rumored to be a feature on a new iPhone mode for sometime, was apparently leaked in a file found on iOS 7 beta 4. The file, called "BioMetric Kit UI" reveals that there will be a tutorial with a picture showing "a person holding an iPhone with their left hand while touching the Home button with their thumb", and "a fingerprint that changes color during the setup process".
Other specs believed to be part of the Apple iPhone 5S include a 4 inch screen and 2GB of RAM and there possibly will be a plastic case with multiple color options for the buyer.
source: FocusTaiwan via BGR