One Piece: Romance Dawn will be localized for Nintendo 3DS care of Namco Bandai Games Europe. The announcement was made during Japan Expo where Naruto Shippuden: Ultimate Ninja Storm Full Burst was revealed.
At Anime Expo, we asked Namco Bandai if they will bring One Piece: Romance Dawn here since other titles have been confirmed for North America. Unfortunately, a representative said to Siliconera there are "no plans" to release One Piece: Romance Dawn in North America.
One Piece: Romance Dawn is slated for release in November 2013 in North America.