I'm sure it will be, but I worry it'll be at the expense of convenience. When we moved from number/pattern unlocks to fingerprints, it reduced unlock time significantly. When you consider the hundred times a day we unlock our phones, and all the different ways we do it, I'll be very interested to see if the process is more annoying.
I tried facial recognition (and retina scan) for a few days before just going back to straight fingerprint scan. My phone is unlocked by the time I bring it into view with the fingerprint, but with the others there was some dorking around with getting the camera at just the right distance and angle, which just made it annoying.
I'm sure it would have gotten better with more practice, but fingerprint is quite a bit quicker, and less obnoxious.
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