... while part leaks seen so far have yet to reveal evidence of the incorporation of a fingerprint sensor, a number of observers have argued that the capabilities could be relatively easily incorporated into the device's home button.
If I am not mistaken, AuthenTec's technology would not require a separate sensor for this -- maybe just a touch digitizer on the screen that is a bit more accurate. From what I previously read, AuthenTec's technology leverages touch screens and sliding a finger across them to identify fingerprints. This would be the perfect complement to "slide to unlock".