Personaly I'm really excited for this. I started playing DnD in 2002, so I completely missed out on a lot of cool 2e things like Dark Sun and Planescape. My first exposure to Dark Sun was the Dragon/Dungeon feature on it, which got me intruiged (I like the focus on psionics, because I really liked the Expanded Psionic Handbook).
As for the whole feywild debate, I'd like to weight in the opinion of a relative young'un who doesn't have as much history of the setting and past experiences and lore coloring his opinions... You know, just for a fresh perspective.
The Feywild should be extinct. Not non-existant, extinct. Athas once had one, but Defiling magic drained the Feywild first. The Feywild is not only "nature" turned up to 11, but also magic. Arcane engery suffuses the Feywild. If Defiling magic drains energy, then it might be the case that the original users of Defiler magic didn't even necessarily know they were defiling. They just tapped into this apparently limitless source of energy. Little did they know that they were destroying an entire plane of existance. And once the Feywild was siphoned off completely, with not even a dry husk to leave behind (because even a husk has inherent fey energy in the Feywild), the defilers were addicted to the practice and began using the only other source of energy available: Athas.
How's that sound?