http://www.techradar.com/news/samsung-galaxy-s9-could-have-a-better-iris-scanner-and-two-sim-slots

In the face of the iPhone X and Face ID we’d fully expect Samsung to improve its own biometric security on the upcoming Galaxy S9, and the latest rumor is that it might do this by upgrading the phone’s iris scanner.

According to a source speaking to The Korea Herald, Samsung will give the Galaxy S9 an improved 3MP camera lens for the iris scanner, up from 2MP on the Samsung Galaxy S8.