[notahacker]

In fairness, technology that can reliably tell subtle differences between faces should be adaptable to differentiate between a face and a static image of a face that doesn't even blink never mind change expression (though I suppose you could still fool it with a high res video...). They also mention the option of passcodes as an additional security level. These could still be compromised of course, but so can actual keys.

Personally I'll stick with keys for actually letting people in, but the ability to see who's visiting when I'm out, and leave them automated messages if I'm busy would be neat.

Can't help thinking there's a novelty market for a simple stripped down version that lacks the long range connectivity but simply uses the facial recognition to trigger different cheesy ring tones to identify different friends and family members.