The important strawhats:
Luffy: 1) better application of G5. Apparently he can transform whenever he wants. But I don't think the full scope of his awakening is discovered by him yet.
2) That super magical move that made the Nika fruit so special, whatever it is
Zoro: 1) perma asura mode, in it's full adv CoC capacity
2) black blade and fucking finally the actual benefits of having your own black blade (forged with your own haki). I still believe zoro wasn't able to use shuusui fully since it wasn't his haki that made it black
Sanji: I have no fucking clue. Some burning leg with a different color?
The other strawhats:
Nami: some Zeus hack, hopefully a devil fruit
Robin: konan like usage of her awakened devil fruit. + with hardening
Brook: some ice/undead hack
Usop: hopefully just dramatically dies. That would contribute most to the story (at least my headcanon story)
The rest, including jimbe, i don't have a clue.