Sky dimension

The Sky Dimension (otherwise known as the Floating Island Dimension) is a work in progress by Notch. It "performs well, [but] looks ugly". It is now a confirmed update.

The Sky Dimension was first announced after Notch played Spleef against @Evil_Notch (video is on twitter). It was probably made to be like a "heaven", since the "Evil Mojang" team declared to Nether to be "hell". The sky dimension is not 100 percent confirmed yet, but 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."

Other info

 * The "Sky Dimension" might have been inspired by the Aether, an unreleased mod, creating an alternative, heaven-like world, which in turn, was inspired by Indev's floating island map type.