There someone who's making this game, One Piece Browser based game you can check the game concept about the game on the FB page click my signature if your interested about the game.

they are currently running some Beta version. ( 1 week beta each major update about the game. )

this December there will be another one week straight so stay posted guys and have an adventure in the grandline.

Game Features:

Set Sail / Travel
Fight AI's
PVP
Equip weapons
Tavern
Items
Level
Ranks
ETC's.

check them out guys!! check their beta testers review