In terms of new stuff, Luffy will learn how to punch harder without Nika's help, Zoro AdCoO and cut nothingness, Cook I genuinely don't know, maybe the improved RS that Franky and Usopp were supposed to work on, Nami could turn into a mini Enel, coat herself in lightning, Robin I have no idea, a new demon form? Franky a new Mecha, a ship sized one, Brook a new attack, Jinbei a new attack, Yamato a new attack, Usopp gets CoA and CoC and a new move and finally Chopper, awakening and a new form that condenses all of his forms into one.
Robin could also get awakening, I think Brook's awakening is a one time revive so he doesn't have to live forever and be alone like he was before.