The scan shows the game is broken down into two kinds of stages. Adventure stages have action elements like Luffy swinging on a bar while Musou stages play like Dynasty Warriors. One Piece: Pirate Musou will also have boss characters to fight.
A standalone copy of the game goes for 8,190 yen ($106). A treasure box with bonus items (these appear to be a soundtrack CD and a bunch of pins, but this is unconfirmed) and a custom theme costs 12,390 yen ($160). While Namco Bandai released the Dynasty Warriors: Gundam series overseas, One Piece: Pirate Musou has not been announced for North America.