Now I feel like the Ocean isn't dangerous or interesting enough. I think it needs a few of these features I'm about to mention.

1. Storms: I think when it's stormy over the ocean it should have these big waves, these waves would destroy any small boats. And if you are pushed by the wave alone you will get forced under to the bottom of the sea.

2. Bigger boats: It would be cool if there were bigger boats that sailed faster and could withstand the waves I mentioned, also these boats would be able to hold chests and have a deck that you could walk on.

3. Sea life: Sharks, wales, minecraft unique mobs you get it.

4. Sea plants and potion ingredients: More plants for potion ingredients that would compel us to go out to sea more.

5. Cool sound that actually makes you feel like you are at sea like seagulls and wave crashing sounds.

6. Unique fish that can be fished up: Now there should be certain fish that can only be fished up in the deep ocean that would be very cool.

The Elytra added in 1.9 allowed us to cover an overwhelming amount of terrain from one single jump, and never again would we fear a drop of any height. But now with the new use of fireworks to boost ourselves in the air, we aren't simply "falling with style" anymore are we? The new feature allows us to reach parts of the world that were once only reachable by ascending slowely in Creative Mode or even spectator at full speed.
A new frontier has opened up to the Minecraft player: The Skies and that is probably what makes this new feature so beloved by everyone (most people).

So what naturally insues is the desire for a reason to soar so high. Sure, we can now cover terrain that would have taken hours back in 1.5 before even horses, and flight PVP can now potentially be a thing ;).

Jeb has opened up a new world for us. And like the End, the Ocean and the Nether, this one is also just ripe for expansion. So what are some of your ideas/predictions for a possible expansion to the sky?