A ComicBook author has suggested four setting ideas for future "Unearthed Arcana" playtest content for Dungeons & Dragons: the Nine Hells, the Feywild, the Shining Citadel, and the Abyss. The article notes that recent playtests and existing content have already covered player-familiar regions such as the Underdark, Ravenloft, and Greyhawk, leaving room to explore locations that have not yet been fully developed.
The Nine Hells is the first location proposed in the article. The author believes that devilish contracts, the Blood War, and the existing Hell Knight playtest subclass can all serve as entry points for designing new character options and adventures.
The Feywild offers another direction. The author values the potential for shifting between fairy-tale atmospheres and darker stories, proposing fey-related races as well as possible subclasses for Bards and Paladins.
Regarding the Shining Citadel, the article mentions its setting in the Ethereal Plane and its use of gems to connect different worlds, suggesting it is well-suited for content focused on roleplaying, character backgrounds, and information trading.
Finally, drawing on existing playtest concepts for the Fiend Warlock, the author discusses whether the Abyss could provide abyss-themed abilities for other classes. The aforementioned locations, along with related subclasses, races, and adventure concepts, are merely the author's suggestions and do not represent confirmed official updates.