Serio released Beta 4 of Castlevania Fighter.
Reimu, Werewolf, Hammer, Death, and Jonathan Morris
Rusalka, Paranoia, Blackmoore, Medusa, Gergoth, Astarte, and Cyclops (replaces The Creature)
More videos + character move lists at Serio's Website, linked up above.
On a side note I have yet to play it(as well as anythign mugen released in the past month), but if it is anything like his/her previous betas then it is awesome! If you like Castlevania atleast. xD