Originally posted by KingKickAss:

They're planning on doing more with the ocean, yeah. They also did just add fish.
A secret ocean boss would be really cool, but how the fight would actually go, I have no idea. If its threatening to players, it would likely blow your ship up which would be the end of the fight, and its not like you can repair it or anything way out in the ocean.

Maybe you kill the boss over the course of the entire game, it just appears randomly in the ocean and you chip away at it before escaping. The boss never healing up.

I have been thinking about this a lot. I believe that fight from the ship cannot be an option just because the boss would probably destroy it in one hit.
I would like to see a big shipwreck in the middle of the ocean as the boss spawner. Or some kind of ship graveyard… generally, my idea would be to have solid ground for boss fight. And the boss have to be either Kraken (huge squid like creature) or Jörmungandr (world serpent, one of Loki’s children).
Since vikings were great sailors/explorers, there are a lot ideas that could fit in this game for the ocean biome update. However, this is the most difficult biome to develop since it is available from the very beginning of the game and we also need to sail a lot during early game stages. Even developers said it’s the tough one to develop because of these reasons.