I don't think it's going to be a jellyfish, they don't really seem like a "nasty hostile mob", they kinda just float around. And it's not going to be a new squid variant (kids shouting Kraken, sit down) when squids are like the only mob in the ocean.
Hostile dolphin seems kind of weird, but it is true in real life, more people are raped to death by dolphins than eaten by sharks. With that in mind, however, adding hostile dolphins would be nothing short of a rape joke, which wouldn't belong in a game like Minecraft.
Personally, I think/hope that it's either a barracuda or some kind of fictional mob, maybe based on a prehistoric sea reptile (like a mesosaur or icthyosaur, but maybe a little smaller).
Also, ADD FISH AS A MOB! Jeb pls. With this new hostile sea creature, you could make it eat fish.
TIL that dolphins are disgusting little creatures.
I'd personally like a new unique mob like Creepers, Ghasts and Withers (Just realized that the main 3 unique mobs are also all explosive :P) Maybe something inspired by ancient marine reptiles like mosasaurs and pliosaurs, or deep sea life like the Angler Fish?
Personally, I'm hoping for Sea Monkeys! I'm not sure how that would fit the description of "nasty"? But, whatever. Sea Monkeys in Minecraft would be totally awesome. Maybe for something super nasty, a mob modeled after the "Creature from the Black Lagoon?" It spawns in the deep, but crawls out of the depths at night and wanders close to the shore looking for victims to drag back into their watery graves. Mwahaha!
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Ahoy, Oh Great and Mighty Flying Spaghetti Monster! Touch us with Thine Noodly Appendages! Let us glory in your great and wondrous meaty balls! May your holy beer volcano be everlasting and your stripper factory be without end. RAmen!!