Take it with a huge grain of salt considering this is the same leaker behind all the rumors around Persona 5 R on Switch and technically we haven't seen that yet (maybe it will get announced soon, we'll see)
It would be reasonable to have more SMTV news since we don't know much about that game, but it could also be an HD remaster of a previous SMT entry (Nocturne? Yamai hinted at that few times in the past)