Loregy has a great write-up on why the differences between the Emerald Dream and the Maelstrom, and ideally which of the two should be the next World of Warcraft Expansion. There are two different camps of followers for the next WoW Expansion, the first group believes that the Maelstrom will be the next expansion (possibly [...]

According to WoWWiki, The Emerald Dream, also known as the Dream and the Dream of Creation, is the verdant realm of the Dragon Aspect Ysera. It appears to those who travel within it as Azeroth would have appeared without the development of the sapient races, which means that it is what Azeroth would have been [...]