With all these security flaws going around recently especially with the PIN cracking robot, its a good time to implement a biometric scanner into the iPhone. According to the code the scanner will be built into the home button, which in my opinion is a pretty neat concept. Even though this is just a leak in code, so nothing official, lets hope we see it in this years iPhone.

Source: http://news.cnet.com/8301-13579_3-57596001-37/biometric-scanner-code-spotted-in-latest-ios-7-beta/