Well, imagine that the rumor is true (personally, I doubt it). The question would be, what will be the plot of SoTN 2 (if is a direct sequel of the PSX one)? A plot involving Maria in her search for Alucard? Shaft is not dead? Alucard is missing, so Richter and Maria will search for him? Dracula rises... again a few days after the Castle was destroyed?
Although, the name Symphony of the Night 2 is very ambiguous to me. Is there other CV game with a number follow-up (without counting I, II, III, IV)?, like Lords of Shadow do with his sequel... (I mean, there´s no Dracula´s Curse 2, Simon´s Quest 2, Dracula X 2, Lament of Innocence 2, etc.)