What would the benefit be to have this feature on the HomePod? I can't really think of any good uses of this tech off the top of my head?
I would guess it is for keyless entry locks for homes, I have a system that uses a keypad or fob, can also be opened with an App, but face recognition would be more secure. Amazon are working on a system at the moment for couriers to go in your house and leave a parcel, I can't see me ever doing that plus my home insurance would be invalid
I would guess so as technically you need to unlock my phone with Face ID to get to my App, I have a doorbell with live video, its the Ring system but not 100% reliable, I have had a mesh wifi system installed and apparently this confuses the Ring system as it bounces between zones, Ring are sending me one of their own repeaters called a 'Chime' that will work direct from the router to counter that issue. Maybe Ring will have face ID in the future. I have had a Netatmo camera system throughout my house for a few years and that has face ID, it lets you know who enters by which door by name.