We could very well see a Nokia 9 this year sporting an in-display fingerprint sensor. The information comes from a source close to NokiaPowerUser and goes on to say that 2018 flagships from HMD Global are also likely to sport a notch to maximize the display area given the native notch support in the upcoming Android 9.0 P OS.
https://www.notebookcheck.net/The-Nokia-9-will-likely-sport-an-in-display-fingerprint-sensor.289016.0.html