Once hardware starts coming standard with the required cameras (am advised by our account manager we should start seeing these builtin by the end of the year) I can see this becoming a really useful way of enforcing stricter security policys within the workplace without making it too difficult for the end users to want to use it.
For a more in depth look at Hello I recommend watching module 10 of this MS Virtual Acadamey on Windows 10
https://www.microsoftvirtualacademy.com/en-us/training-courses/getting-started-with-windows-10-for-it-professionals-10629
To those that worry about using the camera to authenticate, Look at this screenshot from the above MVA. The left image being what is used to authenticate windows, the right is a photo from the camera.
