Yesterday's findings of folders make it certain that the iPhone 5S has a fingerprint sensor. I already see the competition scrambling to change upcoming smartphones to add fingerprint sensors to compete with the iPhone 5S this fall.
It has been already rumored a long time that Apple is going to integrate a fingerprint sensor in the iPhone 5S. The company has bought a fingerprint sensor company called Authentec to get the technology. Yesterday a folder found in an iOS 7 beta release confirms that there will be indeed a fingerprint sensor in the iPhone 5S.
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How it will work is not clear yet. Ideally the sensor works through the screen. Apple has filed a patent describing this. The alternative is to have the sensor inside the home button.
To lock and unlock the iPhone via a fingerprint scan is going to be making owning an iPhone more secure. I am never using the passcode feature because it is a pain to enter the code each time I want to use the iPhone. If the fingerprint scanning works fast and reliable it will be great new iPhone feature that other smartphones will be definitely want to match.
Most likely Samsung will show a fingerprint smartphone even before Apple will reveal it this fall.