VJump has posted a new trailer for One Piece Kaizoku Musou, Namco Bandai's pairing of One Piece with Tecmo Koei's Dynasty Warriors/Musou series. There's a good amount of gameplay, so be sure and check out the clip.
You can view it at VJump's movie page. I've included a YouTube version below.
The quality of the clip is pretty crappy, but that will hopefully be addressed when the clip is posted to the game's official site. Namco Bandai says that this is due on October 7.