Just imagine.
The year is 2024, sixth edition is on the horizon, if that is still a thing. They've done Eberron, Planescape, Spelljammer... and they want to send 5th edition off with... Dark Sun.
Now keep in mind, ever since Athasspace turned into Doomspace and the Hadozee emergency, chances are indeed very slim it'll ever come out. But what if it did, what do you think it'll look like?
Fire away!
Like shit.
4e Dark Sun was crap and 5e Dark Sun would be more of the same.
I rather liked 4th ed Dark Sun. I actually got to GM it. I can't say I'm a fan of 4th edition, but most of the kinks had been worked out by the time Dark Sun came out. It was mostly faithful to the original setting, with a few tweaks. And they smartly set it just after Kalaks' death, instead of the monstrosity of the "updated" setting with all the Cerulean Storm nonsense.
I never played 4e, and have only given a glance at a PDF of the book, but they shoehorned Dragonborn, Eladrin and Tieflings—none of which are really appropriate or relevant to the setting—and expected you to use standard stats for dwarves, elves, half-elves and halfling, rather than provide setting-specific ones, when all of those races are supposed to be significantly changed in Dark Sun. They only include stats for Muls and Thri-kreen, which had no penalties to Intelligence, and Muls got a bonus to Wisdom for some reason.
Then they also included notes for shoehorning other D&D races as well, giving tacit encouragement to allow the whole kitchen sink in, when Dark Sun explicitly had a race purging Cleansing War as part of its backstory, where human champions tried to wipe out every other race (and succeeded with Goblins, Pixies, Gnomes and Orcs, at the very least), meaning that it shouldn't just include every traditional D&D race. The ones in the original material were the ones that survived the Cleansing Wars and managed to thrive.
Also, Dark Sun is not even connected to the Outer Planes, so stuff like Tieflings or demonic creatures make no sense. Genasi at least are more plausible, because Athas is deeply connected to the Elemental Planes, but there was no mention of fairy stuff in the original, and I suspect that the world's connection to the Feywild (which didn't even exist back in the setting's original release) would be as tenuous as its connection to any planes other than the Elemental Planes, which are the only planes the world has a strong connection to. Which means that Eladrin make no sense in it either.
If they already strayed so far in 4e, I can only imagine how bad it would be in 5e.