LiveWii : "Whereas the fans did not hope it any more, One Piece had finally borrowed the voice of the redemption for the Wii players by finding in Atari the editor that it needed. Initially, Atari dated the first part for June, and the second one for October. It seems now if we referred to the European Atari Press site that the both will be sold together in October."
Updates:
Part one will be coming out in June