A couple of iPhone analysts are reporting that the iPhone 8 (or whatever it gets to be called) will forego a fingerprint scanner in favour of 3D face recognition technology. Whilst I might be convinced that Apple would add both, the absence of a Touch ID sensor just seems very far-fetched.
Touch ID is a requirement for Apple Pay, one that can't easily be replaced by any kind of face recognition. Can you imagine the chaos caused by users trying to scan their faces whilst also triggering NFC on a card reader?
Never going to happen.
So either Touch ID gets added under the OLED screen of the new iPhone or it goes onto the back. Either way its going to be present, 3D face recognition may or may not join it, but can't as yet replace it.