User blog comment:Fintin/Chapter 704 Review/@comment-4374114-20130403183641

Unless Rebecca is named in the Chapter title in the next couple I would guess not a new crew mate. Going back over the chapter titles nearly every Straw Hat had the chapter named for them when their official name is first revealed, Robins wasn't so long as she was Miss. All Sunday but was named Nico Robin when her name was specified. Everyone else has met this criteria except Brook, who has never had his name for the Chapter. Now I know people will then point out all the named chapters that didn't become a Straw Hat, but for me until I see that I'll hold off on such assumptions.

That Guy, "Straw Hat Luffy", Introducing "Pirate Hunter Zoro", Introducing Nami, Captain Usopp Appears, Introducing Sanji, Introducing Tony Tony Chopper, Nico Robin, The Franky Family, and future, Jinbe, Knight of the Sea