Parmandur
Book-Friend
I think if/when they do Dark Sun, they will do up Wild Talents similar to Dark Gifts or Supernatural Gifts. Maybe reprint the Psionic Subclasses, maybe they will pull off a Psion of soem sort.I don't have anything to add yet, but it's particularly interesting because it does imply certain things, like if WotC did do a 5E Dark Sun, it would have Defilers - but the lack of mention of psionics (even as something like "strange powers") is perhaps revealing (esp. as back when the DMG was written WotC was thinking psionics would relatively soon be in 5E). Also Birthright gets a write-up, which I'd forgotten and is faintly surprising. Krynn is tied pretty specifically to the War of the Lance period too.
Birthright is still consistently included in their surveys about Settings and such, I think that WotC sees potential there for a "Political Machinations" genre booster that stands out.
If they do anything with Dragonlance, a big old reboot seems to be the order of the day.