https://www.techradar.com/news/samsungs-galaxy-s10-could-come-in-three-models-according-to-new-rumor

We've heard the rumor that Samsung's next flagship could have a triple-lens rear camera setup, but now it appears that the latter might only be featured in one of three new Galaxy S10 models that will be released in 2019. 

According to ETNews (by way of noted leaker IceUniverse), Samsung is planning to launch three new S10 devices in the first half of next year, each sporting a different rear camera array.