User blog comment:Sono kaizoku/new shichibukai/@comment-1908942-20100822214055

That, and he's, you know, a Yonkou.

Anyways, my guesses is one character we know already (A bigger bounty-having Buggy, a press-ganged Bonney, or someone else) and two new characters. One of which will probably not be human, like a Longarm or Elbafian Giant.