I think that there should be a "Sea Update" because other than having to cross it to get somewhere, going out to get water, or to kill squids, there isn't much to do in the water. A few of the things that I think should be included in this update are:
-More boats (Iron, gold, and diamond boats)
-Rising and lowering water levels
-Floods and droughts
-More sea creatures (Fish, crabs, lobsters, sharks, turtles etc.)
-Sea plants (Sea weed, Sea Anemone, Coral etc.)
-Waves
-Whirlpools (Suck you underwater and drown you unless you are wearing scuba gear)
-Scuba gear (Mask and tank allow breathing underwater for a period of time, flippers allow you to swim faster).
-Hidden City of Atlantis (Diamonds, gold and emeralds can be found within it)
-Shipwrecks (Have chests in them)
-More boats (Iron, gold, and diamond boats)
-Rising and lowering water levels
-Floods and droughts
-More sea creatures (Fish, crabs, lobsters, sharks, turtles etc.)
-Sea plants (Sea weed, Sea Anemone, Coral etc.)
-Waves
-Whirlpools (Suck you underwater and drown you unless you are wearing scuba gear)
-Scuba gear (Mask and tank allow breathing underwater for a period of time, flippers allow you to swim faster).
-Hidden City of Atlantis (Diamonds, gold and emeralds can be found within it)
-Shipwrecks (Have chests in them)
No promises though.