An APK teardown of the Settings APK in Note 8 Oreo builds reveals a new biometric authentication called 'Intelligent Scan' that could probably feature in the upcoming Galaxy S9 and S9 Plus. The APK teardown further reveals that the new dual-camera setup in the S9 Plus could enable depth-sensing stickers that can be added to photographs.
https://www.notebookcheck.net/The-Galaxy-S9-S9-Plus-could-feature-Intelligent-Scan-biometric-authentication-and-depth-sensing-stickers.280386.0.html