A Korean IT news outlet claims that Samsung is developing three-dimensional time-of-flight (3D TOF) modules for next year's phones. 3D TOF is linked to improved depth-sensing and AR capabilities. The Galaxy S10 line may be in line for these next-gen sensors.
https://www.notebookcheck.net/Samsung-Galaxy-S10-could-come-with-3D-TOF-sensors.366056.0.html