Although virtually no flagship from a major brand comes with just two cameras nowadays, one of the three upcoming Galaxy S10 models is expected to feature a single camera on each side. On the other hand, the top-of-the-line variant apparently has a total of five cameras. In the end, this might be just another partially accurate rumor.
https://www.notebookcheck.net/Samsung-Galaxy-S10-specs-sheet-surfaces-on-Weibo-still-a-few-months-left-until-launch.344146.0.html