User blog comment:The ASL Pirates/When Will the Next SH Join?/@comment-24.235.56.170-20150601152659

Given Oda's writing, you can bet that there will be 10 crew members. Luffy said it, so it will be true.

The real question is whether that person will join before or after Jinbe. And if you put any stock in the cover stories, Solo Journey of Jinbe included a panel where Jinbe stood beside the number 10, which as far as I'm concerned is textbook Oda. So if we count Luffy as 1, then Jinbe as 10 means that no new crew members will join until after Jinbe.

On the other hand, if we count Zoro as 1 (first crew member), then we definitely will get someone joining soon, and maybe even on Dressrosa. I just can't remember how the numbering scheme works when Oda drops his hints.

This next bit is pure speculation, based mostly on what I would prefer to see, but I think a minkman would be a good idea, a woman would be a good idea, and a weird devil fruit would also be a good idea. So if we see any combination of those three in the next couple of arcs, my vote goes there. And given Jinbe's relative strength, I would guess that they would be somewhere between Franky and Usopp in terms of fighting ability.