Apple's probably been working on the facial recognition for quite some time (like years). It wasn't something that happened over the last few months that we've been reading about with the leaks of the new iPhone. They've also probably been working on incorporating it into other products, like the MacBook & MacBook Pro? We already know that the forthcoming iMac Pro will have a 1080p webcam. Since no one was able to touch the demo model at WWDC for a more close-up examination, who's to say that it isn't already in the works in other product lines?