I doubt Smoker's gonna join, just like Coby he seems to know about the wrong doing of the marines but still wants to bring justice into the world, while his oponents were strong i did expect more from his fight against Vergo. I can see the samurai and his son joining but then we already have 3 swordsmen in the crew, and the kid's probably too young, just like Shanks didn't let Luffy into his crew.
I remember in another site some people mentioning the blind guy was going to be one of the new admirals, but i'm not sure about that. However i think i know from where Oda's inspiration to the bling man came from, and that's the Zatoichi films:
He was a blind samurai posing as a frail old man, seems to fit the bill considering Oda has taken much inspiration from old Japanese classics, as the three admirals were based on the appearance of actors.
I'm liking Dressrosa, as expected it's very inspired by Spain, i just hope one of the marionetes doesn't become a plot point for us to feel sorry and for Luffy to have more reasons to defeat DoFlamingo.