"One Piece" Chapter 839 spoilers is already out which will feature the wedding of Sanji and Pudding. While many expected that Luffy will defeat Cracker in the previous chapter, it did not happen. It appears that Cracker is indeed very powerful.
While Luffy was giving his everything to beat Charlotte Cracker, he failed to do it when Cracker surprised him when another person came out of the armor who cut his arm and even nearly cut his head. It was discovered that Cracker ate a Biscuit Devil Fruit which gave him the ability to create different biscuits.
Since Cracker is a good craftsman, he managed to build warriors and weapons for the biscuits and even used it to make an armor. Because of this, it is possible that the battle of Luffy and Cracker will continue in "One Piece" Chapter 839.
As for Nami and Pound, they were accompanied by the Seducing Woods as they went to Whole Cake Island while Chopper and Carrot escaped the Mirror World of Charlotte Brulee, which they discovered as a portal to the Whole Cake Island. Fans are speculating that they will use their discovery to get into the castle of Big Mom. Others predict that Brook will control and posses one of the soldiers of Big Mom and that the Soul King will use the Devil Fruit.
It is also said that a Capone will be betraying Big Mom and that Nami will have a big role for the next fight while the Sun Pirates will learn what Big Mom's crew did to their caption and will make a move to fight them.
It will also be a special day for Sanji and Pudding because they will be exchanging their vows for marriage but it is not yet confirmed if they will indeed be wed since the previous chapter revealed Shanks who might be crashing the wedding, a Reddit user said. Others theorize that Shank might be the one to marry because of the roses on his pants.