A few weeks ago, a leak rumored that the S10 phones could feature new fast-charging technology. New information, however, indicates that the reality of the matter could be different, and S10 owner may have to put up with Samsung's good old 15W fast charge.
https://www.notebookcheck.net/The-Samsung-Galaxy-S10-phones-will-feature-Samsung-s-traditional-slow-fast-charge.395111.0.html