The Home button of iPhone 5S contains several new components that the same button on iPhone 5 didn’t have and this could suggest the presence of a fingerprint reader.
The show a new square-shaped component right next to the button and at the center of the cable there is another rectangle part that Apple hadn’t included before.
Given that previous Home buttons had a complex functionality, such components were useless, but it is likely that the implementation of a fingerprint reader requires additional components.
However, if the next iPhone 5S won’t come with a fingerprint reader, we can expect these new parts to carry a different functionality.
Source: Sonny Dickson