I noticed one of the users posted the different version of levels 427 and 433. I have checked the newest version of Candy Crush I noticed that levels 426-434 are changed. All levels contains Bobber, which is the upcpming element in the game.
That mean we know the function of bobber. This element will spawn jelly fish if it get hit by special candies. Then the fish will swim out of the screen and at the same time each fish will swim in the board and target jelly (if jelly is on the screen) or random spaces. They can also target blockers if there are more enough.
Note: All contents in this blog are not applied on web version.