A long time ago we were hinted there might be a sky dimension in the works, I'm sure those plans are long gone now but with the recent firework rockets + elytra addition, the games life could be extended with a new endgame dimension. Floating islands and the like would be perfect for wings and rockets, maybe even a boss who would be found in the clouds.

I'm sure the idea would get your imagination going but what i find interesting is how well setup the games tech tree and progression is for new endgame challenges. 🙂