I think Usopp will get a new bounty, as God Usopp, which should be quite high, to build up his liar hype, with an unrealistic bounty. It's just fitting with his character. Likewise, Sogeking will continue to be a different person with a different bounty, and might up just for being a part of the Straw Hats (Unless Fujitora actually unveils the mystery, which I hope he doesn't).
Brook will get an updated bounty to show his new skeleton form, his former bounty was already associated with him, so that will most likely happen. It's similar to Nico Robin, from child to adult. I don't expect the other members to have an updated picture, with the exception of:
Sanji, which will most likely have an upgraded drawing, because it just fits his character to be unknown. Or at least it used to. Someone made a great analogy of him being the Bishop of the crew. He travels diagonally through the plot, normally staying out of the major events and intuitively just maneuvering the entire plot from the back stage, arriving at the culmination of the storylines with a crucial finalizing blow. I was sad that Sanji wasn't like this after the time-skip, but I think his bishop/Prince persona might be resurfacing, since he did meet Viola, which gave him and, by proxy, the crew, some great insight into Doflamingo and the Dressrosa history. And the bounties reflect that, Sanji is just supposed to be incognito.
Chopper is still just a pet. That's the character's gimmick. He's insanely powerful AND useful to the crew, but he isn't perceived as such by the observer. To the rest of the world, he's in fact, the pet. And that is his charm as a character. So the bounty will still reflect that. I think it will increase, again, because he is part of the Straw Hats, but it will still be tagged as a pet bounty.
For the rest of the crew, I do believe they will get a boost. I'm of the same opinion as the majority that Jinbei will join, but Luffy will have a higher bounty first. If anything, BECAUSE Jinbei joined, and the Captain is always the highest threat, because he commands the other bounty heads. But the Straw Hats has a whole will get an upgrade, because Fujitora is there and will assure that. He has already voiced this opinion, the Straw Hats are very nice people, but they are a threat, and they are a threat at a very fundamental level. They are enemies of the established norm, and they have the highest potential to bring the very World Government down, and throw the entire balance of the known world into chaos. This is much worse than any physical threat or civilian-life threats, their actions collide with the Gorosei themselves. Aokiji knew this and voiced this, Fujitora now knows this, and Akainu, the now Fleet Admiral knows it as well. After Dressrosa, when Fujitora reports to Akainu, I believe the Gorusei might start giving orders to target the Mugiwara directly, and their bounties will increase.
As for other bounties, if we see someone else get a bounty, it's almost clear they will join the crew, similar to the Franky situation. Now we just need to know which non-straw hat will interact with the marines directly in support of Luffy and the crew. At first, or at least so far, Sabo fits this prediction, but I believe he is the exception of the rule, one for being Luffy's brother, and it's already established they are captains in their own right, in relation with each other, or at least captains of their own adventures (since both ended up crewmates of other people they admired ), and two because they are Revolutionaries, and Dragon is a bigger threat to the WG ( from their eyes, at least ) than Luffy.