One issue with the 'faceID' (as opposed to touchID) is that if the phone is in a mount or otherwise not in your hand, you have to then have it actually facing you or however it needs to 'capture your image'. A finger is much more maneuverable that your face, especially if driving, etc., or even as a passenger. I really can't see such a quick transition to ONLY 'faceID'. An option, maybe. Only? Color me still suspicious.