http://www.techradar.com/news/all-of-next-years-iphones-could-have-face-id

Face ID, Apple’s advanced facial recognition system, is debuting this year on the iPhone X, and is exclusive to that top-end handset – but next year it could be a feature of every new iPhone.

According to well-known analyst Ming-Chi Kuo of KGI Securities, Apple will abandon its Touch ID fingerprint scanner completely in favor of the Face ID system, enabling Apple to capitalize on the lead it has with the technology.