I have a hunch that Boa Hancock's terrible past will be revealed to the amazon lily somehow. When you look at it Hancock snuck Luffy into the gaol and he stirred a major commotion and she also goes against the goverment and fight smoker. I think after the whitebeard arc, the goverment will find out Hancock association with Luffy, stripped her of her status and jailed her. Luffy and his crews probably are going to rescue her and her terrible past will be fully revealed. Plus Luffy has becomes so famous that anyone associate with him is considered as an enemy of Wg and Hancock is no exception.
I think white bear vs. the WG is a perfect opportunity for Dragon to strike and of course, he is more than likely will not let his son die. I would love to see Dragon fight against Sengoku. Wouldn't you?
When black beard is at the great gaol, what do you think he meant when he said he'll stirred up "something" like which the world has never seen?
After defeating gecko moria, the crews left and Lola's crew stay for a day until the fog is lift. Judging from the omnious ending, I think her crew got caught into that evil mist/cyclone. What do you think?