Let's recap the progression the Straw Hats have made in 2016:
Luffy: Gear Fourth new form, Tankman. He also gained a single new technique for both Tankman and Boundman.
Nami: New Clima Tact that uses Pop Green as well as new techniques for it and her Sorcery Clima Tact.
Sanji: The True Black Leg, Sanji has used Armament Haki for the first time. He also has two new techniques for Diable Jambe. He is also a trained swordsman but prefers the kicking style he has.
Usopp: New Pop Green technique.
Brook: New Soul Solid Attack and a sort of "King's Haki over souls/Homies"
Robin and Chopper have a new tag team move.
Other than that it can be assumed that each member have gained some of physical strength, but maybe Luffy and Sanji gained the most.