Don't Want To Type, Moto X Can Now Listen to your PIN
If your hands are busy doing some other stuff and you can't type your PIN to open your Moto X, then you will soon get rid of this problem.
Moto X touchless control app will be receiving a big update anytime now which will allow users to speak their pin in order to unlock their Moto X. More Google Now commands now work without having to unlock your phone first. Personal information such as emails, messages, and contacts are still protected by your PIN or password.
This update will only wok on devices running android 4.4 kitkat so if your device is running on an older android version then, don't expect that your device will be receiving this update as of now.
Source: Google Play