http://xbox360.ign.com/articles/616/616617p1.html
Following the unveiling of DOA 4 at Microsoft's Press Conference, Tomonobu Itagaki spoke briefly with IGN regarding his latest fighter. First, Itagaki assured us that the version we saw at the conference was only 15% complete and that the game has not yet tapped into the true power of Xbox 360. We assume the clipping seen in the early part of the trailer won't be part of the final build, which is still targeted for Xbox 360's launch.
Further, DOA 4 is now focused on defense instead of offense. Gamers will need good reflexes and a sharp eye to anticipate their opponent's next move. Expect more fluid combat with players reacting to one another in kind in larger environments that are far more interactive than previous DOA titles.