If this is a new game, there is nothing that says it is a sequel to HoD. Ok, so it has Harmony in its name. That doesn't really mean anything. I could be 1999 game (unlikely), the Alucardvania we were/are excited about, or something completely different. All this assumes that it is an actual game that will be made.
On another note, I miss that way the CV games:
(something having to do with music) of (something else, usually dark/evil/unpleasant)