The barbarian totems for example, since there are no wolves, bears and eagles in Athas, I had to look around for beasts with similar qualities. The Klar is literally a big nasty bear, so the choice was easy. The Dagorran (as presented in 4E) is a tracking beast that hunts in packs, so very much like the wolf, specially the benefits provided by the wolf totem. Finally the eagle was a hard one, I could not find a bird of prey besides the Kes'trekel, which is more a carrion bird. I really don't like it for a totem, but for now I'll leave at that—perhaps later I'll work a new totem from scratch based on an Athasian beast.
Regarding the druid, I gave the circles a little name tweak, and created new circle spells lists, more appropriate for Athas peculiar geography. I was tempted at first to use just four types of terrains: the Tablelands, the Sea of Silt, the Ringing Mountains and the Forest Ridge—I guess someone can try this simpler approach and use the desert, coast, mountain and forest spell lists, respectively. But I rather worked on the types of terrains presented in the 4E Dark Sun Campaign Setting book. Some of the spell lists may seem repetitive, because the differences are subtle. My three main focuses when creating the lists was theme, traveling, and survival in each particular terrain. Let me know what do you think.
