http://xbox360.ign.com/articles/635/635119p1.html
Itagaki explains that the characters in Dead or Alive 4 move too fast to be properly captured at sixty frames per second.
.....Dead or Alive recreates the world as your eyes would see it, which is with fast objects blurred. Team Ninja is considering including a cameraman mode in the game so that players will be able to snap pictures with this effect clearly visible.
DOA4 will include more than 20 characters, Itagaki reveals, adding that he himself came up with eight of the characters. Itagaki also states that he came up with the storyline for the game.
tagaki reveals that major changes have been made to all the characters fighting moves. Moves that have been in the series until now have been replaced.