Castlevania LOS 2 looks like it will be an incredible sequel to it's previous installment. With the same quality of graphics, similar gameplay mechanics, yet with A lot of new tricks and characters, I can only see this game being a success.
Gabriel/Dracul now has extremely powerful vampiric abilities, and he will collect and use these as the game progresses.
The seriousness and 'realistic' design of the first game seems to have been dropped to allow for more fantastical enemies and scenarios. This may appeal to some, while being a bit of a turn off for other fans. We won't know for sure till we see more trailers.
The soundtrack, as with the first game, sounds absolutely beautiful, really supporting the cinematic approach the game will take. The soundtrack of the first game was very well-received, people simply loved it. I hope the sequel is even better.