Developer Keith Krimbel emailed Craig Federighi some questions about Face ID, and got some actual useful answers!
The news about a lockout feature is really handy—even easier than the “press the side button five times” feature in iOS 11. As for the “not staring at it” idea, well, it’ll be interesting to see how well that works in practice.
Also, good to know that Face ID will work with most sunglasses. (Apparently it will work with hats and even scarves as well? That will certainly be a boon to those of us in the cold climates of the northeast when winter comes.)