Krustyland & Squidport future developments?

No one but EA knows for sure but there are still quite a few Squidport stores in the episodes that showed Squidport that are yet to be in the game. As for KL, there are still quite a few rides shown on the official KLand map that are yet to be in the game plus there are rides and attractions from Duff Gardens and Itchy and Scratchy Land that could possibly be brought in KL if they wanted. With all that land in KL, chances more things will be added in the future are very high.