Iga be pimpin' as always.
At first I thought you were talking about the SotN Radio Drama that's being released, but this was even news to me. Well played, sir. However from what I've found out by going through my channels is that this very well may be related to the aforementioned Symphony Radio Drama that takes place a year after the game and features Alucard, Richter and Maria....as well as some new characters including an incubus named Magnus.
Which would indeed make it a direct sequel to Symphony of the Night. The image even nudges one to believe it, as it's looking like Alucard.
Of course, if this all turns out to be true or even semi-true...I'm still very concerned. Announcing this even before the other two Castlevania games are released, makes me think they very well may be rushing things. Then again, who knows. This could be very early development being shown as a teaser, with the game not even being half done yet. I'm kinda hoping so, since you'd think if it's a sequel to Iga's crowning achievement, he'd want to put as much time and detail into it as possible.
It's raining Castlevania these days, though. Two games, a arcade game, a radio drama, and the Curse of Darkness manga being translated and released in the states...as well as the movie and an animated OVA. I'd be overhyped with glee if I weren't so cynical about the whole thing.