As others have said, this was the pitch from the Japanese side for Konami for Castlevania. It lost to Lords of Shadow and the pitch from the European side of the company. IGA has previously stated showing that trailer publicly was a "mistake", likely because it was a pitch and not a promised upcoming work. At the time, as fans didn't know there were three pitches for a new Castlevania game (one from each major branch) fans presumed this was a 3D adaptation of the radio drama which was being broadcast at the time, as that also starred Alucard.
In the end it was more or less a concept video. IGA went on to help with The ARCADE, Adventure Rebirth, and Harmony of Despair as the European pitch went forward as the next mainline console game. The Lords of Shadow pitch they showed around this time hid all of its "Castlevania" elements by name but many people, some even on this forum, found it weird it was a whip wielding game with a character who wore armor very similarly to the artwork of Simon's Quest. Their original pitch, released after the release of LoS1, show a redesigned Simon Belmont wearing white, looking more like an Assassin's Creed character.
I remember when at E3 2009 people thought the press got misprinted information about Konami's upcoming presentation, as it had a game named "Castlevania: Lords of Shadow" when previously it wasn't known as a title in the series. Looking back at it, they really didn't do a good job showcasing this game as the next major entry when so much time was put into the mess that was Metal Gear Rising, a title that never came out as originally envisioned.