Prunyuu. The interview says a lot of what we already know (the difficulties of translating the LoS-world onto the 3DS, combat, "metroidvania" elements, comparisons to CVIII, etc.). Scenario lasts about 12 hours. With magic, Trevor uses both light & shadow, while Gabriel only uses the latter. Simon invokes spirits (ala Maria). Alucard's abilities aren't mentioned. You can play with the characters "according to the moment in history in which you are, but in turn, is not necessary that you play to the history in chronological order." Also, there will be "SpotPass," although they wouldn't elaborate further.
Now for the most important part, music:
Oscar Araujo says that "Classical music of the saga did not hit with the epic twist that gave Mercury Steam and chose to give a different touch and redo it."
Oscar, with a cinematic past, explained it thus: the activity of the player causes the problem of de-sync with action. The music has to convey the emotion that requires depending on the time that the player takes to solve the problems.
The games seeks background music, in the Mercury Steam Castlevania opted for melodic music. Enric Álvarez explained it thus: "we wanted the player to think in the character and how it feels, not in the environment in which it moves." That the music spoke of character and mood. "We told Oscar and he composed this extraordinary music that gets exactly that."
So.. expect more of the same Hollywood-esque style. There might be 1 or 2 classic tunes, maybe 3, but that's it. Blah.