iPhone 5S with Fingerprint sensor confirmed in code references found in iOS 7 Beta 4. Recently Apple has been seeded and bring OTA update to the latest beta, iOS 7 Beta 4. The most interesting is, from Code References in iOS 7 Beta 4, iPhone 5S will be included new sensor.
Fingerprint Sensor is the new sensor that will available on iPhone 5S. From this screenshot we will know about it.