Today Wizards of the Coast released the Elemental Evil Player's Companion. This is more or less a set of character races and spells. What Dark Sun fans will be interested in is the races, Aarakocra, Goliath, and Genasi (there's even a sidebar entitled Genasi on Athas) as well as a slew of elemental themed spells.
This is a companion discussion topic for the original entry at http://athas.org/news/349