Dragonlance doesn't need special rules and WotC would rather player-options sourcebooks to be as generic as possible. And they know if players want only lore/fluff/background then they can buy the older titles in DMGuild.
* We have got the option of the retelling o the original Dragonlance modules, something like Curse of Strahd. If there is a cinematographic production then this will be a new continuity with possible changes, for example goliaths as a specie from Taladas, and ursines(bearfolk) could be more common.
* I have got a new speculation. There is a new event "Reality Fracture" for Magic: the Gathering. I searched some spoiler about the future plot but this is not necessary to be told here. But I can and I dare to say my own theory is this could cause uchronies or alternate timelines in the D&D Multiverse. That could be the reason because they want to say nothing about the last season of this year.
If Valgavoth the terror-eater(Duskmourn) was involved into the event of "Reality Fracture" then not only Innistrad but potentially Ravenloft could be affected. I would like to imagine Duskmourn would become like a planar liminar space, dangerous but you can use to travel between planes, or to raid some dungeon. (Valgavoth creates threasures like baits, and some times it allows dungeon-crawlers to survive and return to their homes to tell their adventures and this will attrack new victims).
The event also could reboot some M:tG planes to become more playable for D&D.
If there is a new D&D sourcebook about Stryxhaven I suspect this wouldn't be an update or sequel but more like an independient spin-off, some thing like "the same doll but wearing a different urban-tribe style".