I think I would be a tad disappointed if Sepiroth isn't a secret boss again since he was in both 1 and 2. And I'm sure there's going to be that Final Mix future character secret boss if not now then most likely a DLC addition.
It would be interesting to see another Disney character as a secret boss like they did in 3D
It would be interesting to see another Disney character as a secret boss like they did in 3D