The new Castlevania Lords of Shadow 2 video game has been fairly enjoyable, and I've actually been surprised at how much I've enjoyed playing through the game revival. However, unlike it's older predecessors, Castlevania Lords of Shadow 2 lives in an age filled with DLC and extra content, so to get the most fun out of the experience, we'll have to wait for Konami to release their planned DLC packs.
According to a forum member on CS.RIN.RU by the name of UbiSergei, the first Lords of Shadow 2 DLC pack will be called Revelations, and it may allow players to play as Alucard. The story of the DLC will let players discover a new plotline and understand "the true extent of Alucard's involvement."
Alucard has been in the Castlevania series since Castlevania 3, so it'll be interesting to see how big fans will react to being able to play as the character. In Lords of Shadow 2, Alucard's father, Dracula, plays a pretty large role in the plotline, so it'll be interesting to see where the Revelations DLC may take us.
For those more interested in the gameplay content instead of the story, the Revelations DLC is expected to come filled with "rich new environments and challenging puzzles" as well as various different creatures for Alucard to fight.
As this information is all unofficial at this point, it's best to take it all with a little grain of salt until we hear something more official from the game's creators.