Quote from jburtson
That sounds pretty darn complex and interesting, my greatest concern is that it is not necessarily needed, and most ocean biomes are small enough that a boat is overkill. I do want more complex boats, at the very least something with a chest, something you can walk on, or something you can build on.
These are pretty much my concerns, too, but remember that you can reshape Minecraft however you please. Digging channels between oceans shouldn't be a problem.
And yes, a true ship should become a portable base, possibly even with the capacity to hold a bed.
I'm seeing a huge vessel, indestructible to collisions, black Jolly Roger sails, a furnace-powered propeller, a cabin with a bed in it and a treasure chest (though you could also put a music player and program in the Great Sea theme from Wind Waker). Sail from island to island, take what you need, and when you're done, sail off to the next location. Living on the sea would be a whole other way to play.