Atlus has launched a teaser website for a project called Persona 5 S. Much like how Persona 5 R ended up becoming Persona 5: The Royal, this new project is likely to be another version of the popular JRPG. Whether this will become the rumored Switch version is yet to be seen, but I think it is incredibly likely at this point.
What makes me believe that is a date of "April 25, 2019" on the website. Since Joker will be coming to Super Smash Bros. Ultimate sometime this month, we may have just gotten confirmation of a port to Nintendo's console and a release date for the new fighter all at once. Or maybe this is a Steam version since the S could mean a lot of things.
Gematsu dug into the source code of the website and found this message: