This is the entirety of how 4e handled Defiling and Preserving:
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Everyone is a Preserver at all times unless you WANT extra power, and then you can Defile, instead.
Defiling, in 4e, was a straight up boost to your damage instead of a constant baseline of the game's expectations.
In 5e, it looks like it'll be a specific subclass of Sorcerers that Wizards and other arcane spellcasters won't interact with. They'll get bonuses from their subclass, like any character, with the ability to Defile for even more power.
And Preserving will just be another way to be a Druid with no cost to it, and instead it'll be the source of their subclass abilities compared to other druids.
There's literally no reason to believe they'll turn around and say "All -Wizards- and other Arcane Spellcasters Defile at all times with no power gain, but also you can choose to Preserve and it'll make your spells weaker." which is what the structure was in the original setting.
Which is,
@FitzTheRuke, really watered down.
These core identifying pieces of Dark Sun are going to be used as general trappings for a couple of specific classes, and the setting will suffer for it. Like a Remake of an 80s movie where the plot is WILDLY DIFFERENT from the source material, the theme is hilariously off from the original intent, but the characters have the same name as the 80s material and the title is unchanged.
Like the 2014 Robocop remake which kept Alex Murphy, but ditched the whole personal question of his remaining humanity and memories in favor of having the cops make it a purely external question of imposed loss of humanity through programming. How the original's designs and over the top gore were meant to be an indictment of 1980s audiences desires for endless bloodbaths and gratuitous violence. Hell, Verhoeven had Murphy walk on Water and act as Christ-like as possible to highlight people's eagerness to pursue and absorb copaganda so long as the 'right' bad guys were being targeted. Instead Padilha tried to write a straight-faced film without satirical elements using the RoboCop character to oppose drones in warfare and policing and copaganda by having the Chief of Police working with the evil faceless megacorp. And where the original had the villain protected by a secret directive that was undermined by someone else saying "You're Fired" to remove his OmniCorp protections in RoboCop's programming, which reinforces the question of Murphy's humanity, in this one RoboCop just decides to override his programming through sheer personal will, proving that humanity is stronger than machine programming!
Is it a good movie? Gonna depend on your personal opinions and perspective. But to me? It's just not RoboCop. I had the same issues with RoboCop 2 and 3 which just bought into the core premise without any examination of the themes or identity of the original and just made movies which praise police and single quasi-divine figures of powerful personal nature.
Hell, RoboCop 2's plot centered on the fact that the only reason Murphy 'worked' rather than immediately committing suicide was his Catholic Upbringing, an invention of this movie to both fulfill Frank Miller's desire to continue to poke at his own religious trauma in his work and serve as a half-assed explanation of how and why they eventually use a death row inmate as the test subject for their new RoboCop design...
Anyway, yeah. I very much feel like they're gonna try to go with the least introspective version of Dark Sun they can. One which misses important themes and identifying characteristics while relying on the trappings to sell the fantasy.
Sorta like this image showing how much they tried to make Robert Burke look like Peter Weller:
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The grime and detailing are gone. But the trappings are the same. And that'll be enough for some.