Mr. Ohya, who previously talked about Persona 5 R before its original announcement, revealed earlier today that Persona 5 S will be released on Nintendo Switch and PlayStation 4 during Fall 2019. An official confirmation will be coming before May, so it seems like Atlus may reveal one of the two releases first during March, as teased in January.
(Source)
Here we go again. For what it's worth, Persona 5 S being the name of a Switch version lines up with earlier rumors and domain registrations.