As an ice wizard, I would love to see the ice professor's homeland. I understand it to be a candy-themed world. It wouldn't have to be a world with a completely new story arc; but, perhaps, it could be a "side" world along the lines of aquila. Perhaps it could be accessed from the ice school's dueling tower.
From what I understand from like hints in both Wizard 101 and Pirate 101 Polaris is a winter world. I am hoping that they do create this world in both games.
As a main world, I see this as very unlikely. I see is more likely as coming out as some sort of minor expansion...or a side world. whatever you want to call it. I just son't see how they could integrate "Candyworld" into the main story-line, but hey, they could surprise us.
