The Spelljammer campaign setting has finally returned to Dark Sun debuted in the days of AD&D as a setting where magic destroyed the world of Athas, turning a large part of the planet into a desert. This is because Athas lacks a Weave equivalent, which means magic is powered by the life force of vegetation.
In the Dark Sun setting, there are two types of arcane spellcaster: Defilers and Preservers. The Defilers have no problem draining the life from the last remaining plant life on Athas, in order to power their spells and smite their enemies. The most powerful among the Defilers are the Sorcerer-Kings, who are performing terrible rituals to transform themselves into dragons. The Preservers use magic in a way that doesn't kill plant life, but it takes longer to use and isn't as strong as Defiler magic. The most powerful among the Preservers are trying to transform into one of D&D's most powerful monsters: an Avangion. These are good-aligned monsters that can match the dragons in strength, and might be the only hope left for Athas. The Defilers control much of Athas, especially as there is already a fully-formed dragon on the loose (depending on the timeline), but there are still heroes out in the desert, seeking to save the world from environmental destruction.
There is currently no word regarding an updated version of Dark Sun for D&D 5e, though it's still possible, as there is one more classic campaign setting which is set to return in 2023. The most recent classic campaign setting to return is Spelljammer, in the Spelljammer: Adventures in Space boxset. Spelljammer: Adventures in Space has a monster book, called Boo's Astral Menagerie, which has a surprising reference to Dark Sun.
Spelljammer Has Defiler Magic From Dark Sun
Boo's Astral Menagerie has stats for Ssurrans, which are the lizardfolk of Athas, though there is no reference to their homeworld in the book. One thing that the Spelljammer Ssurrans do possess is defiler magic from Dark Sun. The Ssurran Defiler monster has a recharge 6 ability called Defile, which drains the life from vegetation within 10ft of the caster, and deals 4d10 necrotic damage to living beings in the same area, healing the Ssurran Defiler for each creature that blows its saving throw.
It's strange that Boo's Astral Menagerie doesn't reference Athas by name, even though the setting has been name-checked in other books in the past. The fact that the Ssurrans appear and have access to a form of defiler magic is interesting, but it's likely just a fanservice reference to a classic setting. It's likely that Planescape is the next returning D&D setting, and Ssurrans will give the only taste of defiler magic in the current edition of Dungeons & Dragons, at least for a little while.