This was an idea made by Minecraft a while ago, and it was never added. It is basically a realm full of small floating islands. It could have some new mobs or a new Boss even (skydragon??) but I think it would be a really cool addition to the game.
A feature that has been removed by Mojang for reasons will stay removed. Some ideas have been shelved by Minecraft such as the Red Dragons and a few other ideas, but the Sky Realm is an idea Notch created, but eventually scrapped it. As for this suggestion, this is extremely vague, you have not provided enough information to make for a valid suggsetion.
What blocks would there be? What mobs would there be? Would there be new ores to find in the Sky Realm? Would their be new natural resources such as new trees, plants, Passive mobs, etc? Would there be hostile mobs? How much health would the Sky Dragon have? How much damage does it do? Would the Sky Dragon have similar or different attacks to the Ender Dragon? etc.
I also see that you're new here. So please read this before making a suggestion, as it provides necessary information of how to make one and what to avoid when making your suggestion.
I don't think their were any official talks about a sky land. If there were one that had been implemented that would have been the end. In addition this post is extremely vague and provides little to no description.
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