I'm not sure if blogs are overly popular here, but I thought I may as well write down some speculation stemming from the newest chapter.
To start off, I think it's fairly clear that Brownbeard will be one of the many pirates that Luffy and The Strawhats will end up facing, if not simply because he has been named as a character, and if Oda simply wanted to demonstrate the inevitable fate of WBs old territory he would have simply shown a gang of un-named pirates and left it at that. I also think we will see something alone these lines happening in Fishman island, which will probably result in the strawhats having to do some work to save the fishmen.
I also agree with most of the people on the wikia who believe that Big Mom is in fact Lola's mother, although it could easily just be a little trick by Oda.
Considering Sengoku's reaction to the news of the Level 6 prisoners being covered up by the world government, I get the feeling that the marines are beginning to get slowly disillusioned by the actions of the WG. The marines already have a disdain for the Shichibukai as former pirates, a relationship that can only be worsened as time goes on. With Magellan's near-death, and desire to make up for his failure and capture the missing prisoners, I'm personally hoping that there will eventually be a time where Magellan and possibly the marines will be forced to work together with the strawhats to capture some of the more dangerous criminals (not to say they aren't all dangerous).
Gecko Moria's 'extermination' at the hands of Doflamingo and the Pacifista in my opinion will not result in Moria dying. Moria will probably escape unless he is shown dying in the next few chapters. If there is no sign of Moria for several chapters then it is likely that he will have escaped, as Oda always seems to be revealing 'dead' characters as still alive, with a few possible exceptions (Mr. 2, who I believe to be dead now). It may even be possible that Moria returns as anotehr reluctant ally for Luffy.
Mind you, this is all speculation, and could be proven completely wrong. What does everyone here think?