Sky dimension

The Sky Dimension (otherwise known as the Floating Island Dimension or the dream world and sometimes referred to as heaven) is a work in progress by Notch. It "performs well, [but] looks ugly". It is now a confirmed update but the releasedate is not known. In a live webcast on the Swedish gaming site feber.se Notch revealed that the Sky Dimension would "probably be a dream world" and that when "you go to bed there is a certain chance that you get dragged into the dream world instead. Then you will be able to do it on purpose later on."

The Datamined Version
It has been found that Notch has left the data in for the sky dimension in the game, so using a mod that enable the code you can access the currant unfinished version of the dimension. in this version of the sky dimension it is always midday, it does not rain or snow, sugar cane cannot be found and although rare, it IS possible to find Redstone and Lapis Lazuli in the Sky Dimension and diamond which is even more rare, can still, possibly, be found. Below the sky dimension is a void like area, or maybe the void itself. The only mobs is the sky dimension are Chickens

History
The Sky Dimension was first announced after Notch played Spleef against a man with the twitter account named "Evil_Notch" (video is on twitter). It was probably made to be like a "heaven", since the "Evil Mojang" team declared the Nether to be "hell". The sky dimension was not completely confirmed until Notch released an update via Twitter stating: "And because PC Gamer made such a big deal of the sky dimension, I guess I'll have to finish it. Consider it confirmed."

Trivia

 * There is a mod with a similar premise as the sky dimension called the "Aether" mod.

Trivia on the Datamined Version of the Sky Dimension

 * The mod that enable access to the sky dimension was made by 303 . (Note: The thread title says it's meant for 1.6.4, but it works just fine with 1.6.5)
 * Although it does not rain or snow in the sky Dimension, Cloud cover appear as if it is raining.
 * Because sugar cane cannot be found in the Sky Dimension. Because of this, you cannot make a Map in it unless you bring the materials before going there.
 * If you select the Map while in the Sky Dimension, your game will display the saving chunks screen and crash, this is probably due to a bug that does just that when an entrance to the void is mapped (remember that the Sky Dimension has void entrances everywhere).

Videos

 * Notch's Sky Dimension in MineCraft Beta 1.6.4
 * Notch's Sky Dimension in MineCraft Beta 1.6.4 - Exploring with Hot Air Balloons!