So apparently a guy who leaked a Persona 4 Arena Ultimax remaster that just got confirmed has now said 2 days ago that Persona 3 is getting a remaster and will be multi-platform. Specifically the Persona 3 Portable version of the game, not sure why they chose that over FES but perhaps some of the content from FES could be added to the remaster.
We know a huge amount of projects and announcements are lined up for the Persona franchise since the 25th anniversary celebrations began. 5 more announcements are scheduled to come in this celebration, with the next being announced February 2022 and the last being announced Autumn 2022 (the last is no doubt Persona 6). So regardless of if you deem this leaker to have any credibility I think a Persona 3 remaster is on the cards anyway.
Persona 3 Portable Remaster - Rumor: Persona 3 Portable is getting a multiplatform remaster (nintendoenthusiast.com)
His Persona 4 Arena leak in July - Rumor: Persona 4 Arena Ultimax remaster in development (nintendoenthusiast.com)
