The Galaxy S10 and S10+ had been rumored to rock a bright red color, that would have been new to the Samsung flagships, prior to their launch. The actual range of shades displayed at this event appeared to debunk this theory. However, the option now seems to be back on the table, thanks to a new exclusive leak of Roland Quandt's.
https://www.notebookcheck.net/Samsung-Galaxy-S10-series-may-get-a-new-color-red.421273.0.html