This is going to be paid DLC. It's going to be released in the coming months
http://www.onepiece-game.com/us/vote-results-who-are-the-3-new-characters/Rob Lucci: This powerful former member of the CP9 will join the fight. Take advantage of his Zoan Devil Fruit. Definitely a character youd prefer to see in your team rather than the opponents!
Caesar Clown: The mad scientist that uses the fearsome powers of the logia Gas-Gas Fruit to take down the fiercest enemies!
Monkey D. Garp: Member of the Marine and grandfather of Luffy, he will bring his incredible strength in ONE PIECE BURNING BLOOD!