Originally posted by marioVSshadow
No, the Ender Realm and the "sky dimension" as you call it (It's actually the Aether and is based off a very famous mod) are two completely different things.
No, it is NOT based of the Aether. And it is NOT named that. Notch himself calls it the Sky Dimension. IIRC, he also said there's NO relation to the mod. At all.
EDIT:
http://www.minecraftwiki.net/wiki/Sky_dimension Nowhere does it say this was based on the mod.
Also, from the linked tweets, it's obvious he didn't originally intend to make it. He was just doing it for fun, it seems.
<Adam> I feel like smwc is a prostitute now, because we put up a porn ad for money