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The artificer is going to enjoy a new subclass beyond one sourcebook. This should mean a sign this class will be supported by WotC.
Will we watch UA about PC species? Somebody could say they Van Ritchen's Guiden don't need an update.
Maybe we will see the Ravenloft logo but the crunch will be designed to be useful in other horror settings, for example Innistrad or Duskmourn (Duskmourn could enjoy a crossover spin-off within Ravenloft, like Dark-Sun), or 3PPs.
WotC should publish something about Dark Sun or some 3PP will create a spiritual succesor like "Dragon Kings".
Other option could be an update edition of "Libris Noctis". This had got an intersting undead bestiary. Grimm but that was the intention.
"Heroes of Shadow" for 5e? Maybe some crunch element.
* Are there female dusk half-elves in Ravenloft? Could be "adopted by Vistani" a background?
* If the sales of "Curse of Strand" were good maybe we could see a reimagination of the "House of the Gryphon Hill" and that third adventure "Bleak House: Death of van Ritchen".
* Ravenloft is perfect for crossovers and collabs with horror franchises. I have read the videogame studio of "Dead by Daylight" are working in a spin-off focused into survival (I guess something style gathering, crafting and building).
* Ravenloft needs no-undead monsters to avoid too specialized undead-slayer build by players. For example choosing living-contruct PC species with second-skin dark-gift (warforged, autognome, glitchling, Weschling, shardmind)