Within the next year to two years there will be a major updating coming. I don't want to give too much away, but the levels will more seamlessly flow together, there will be many more world, more enemies, a full story, complete redesign of artwork, new characters, new attacks and unlocks and much more. This will be released all at once and then the following updates will be smaller to fix bugs and provide smaller features. It will all be free to everyone who already bought the game. There won't be paid dlc for these new features.