While we cannot verify the footage itself, Gematsu understands that a Persona 3 remake has been in development at ATLUS for several years.
Twitter user @MbKKssTBhz5 also spotted a potential domain name for the title—p3re.jp—which is registered to the same domain provider as the Persona 5 Royal website (p5r.jp). The domain was registered on March 15, 2023.