It could also very well be the fighting game for P5, it's more than time for that.
Something like Persona 5 Suplex, but Suplex was already in the name of the previous one...
I don't believe in a game called "Persona 5 Switch", they like to find weird "stylish" names, so it's unlikely. And I would find weird to have a different name if it's the same game as Persona 5 Royal, they would rather just announce the Switch version during the complete reveal of this one.