Zardnaar
Legend
"Defilers and Preservers" showed wizards kits with alternate hidrances instead defiling: Cerulean, Shadow and Necromancers. Some player could ask to can play a homemade variant: a cerulean sorcerer, a shadow artificer or a necromancer warlock.
Teorically ceruleans shouldn't appear before the events of Pentad Prism.
WotC has to choose if they are going to allow space for future classes, for example the shadowcaster(3.5 Tome of Magic) , the psionic ardent or the shaman. Maybe no Athasian species are possible because the "city of spires", a secret faction from "the black spine" (I guess this is not a true spoiler) created a multiplanar empire or they could conquer a neighbour wildspace.
Other player could to ask to can play a "sha'ir"(class from al-Qadim) explaining this is a elemental summoner and therefore a primal spellcaster.
Would be possible a "cult of Thoon" in the Athaspace?
I dont think WotC will do anything with Cerulean wizards. Obscure class from Kate in the cycle of DS products.
I suspect they will go with 4E timeline or OBS timeline.
Alot of the latter DS stuff isn't overly popular even in DS circles as they kinda blew up what made DS appealing in the first place.

