Hypothetical idea for a new update

[Fenix93]

As the Feywild is co-terminous with the Prime Material, you could use the existing wilderness areas as a base...
Eveningstar Public Area, Battle for Eveningstar Quest and the King's Forest wilderness all lead on one to the other, so you could put an entrance anywhere along the West edge of Eveningstar, leading into a new Wilderness using the quest and wilderness as the base, but with Eveningstar being replaced with Faerie homes the further from the entrance you get.
Colours could be brighter, more trees could have blossom, and more butterflies, floating motes of light etc could be added to give an otherworldly feel, while still being familiar enough.

absolutely no I do not think it's like the shadowfell an alternative version of reality ... this is not Wow where we are in the EmeralDream and so it's all an alternative version of reality (in positive).

There are plenty of potential quest entrances throughout the Kings Forest that could be used - odd cave mouths here and there - and plenty of locations that could easily be adapted (the drow's "dead" area could be alive and the location of the faerie court, with the inside of a palace accessible where the Underdark entrance is.

Making a mappaspeculare of the king forest I see a bit of a "madness" in quotes ... unless I revamp the area a bit and add guides as they did for Ravenloft, then I would agree, but I would have preferred something similar to the penultimate pack "Duels in the Undedark" where wax a single Hub with inputs to the quests ... I imagined something of that kind.

Monster-wise, I would keep things similar to what already exist (Satyrs, Dryads, Hags, Pixies, Pseudodragons, Will-o-wisp, sentient plants) and add in a few others as standard monsters, then create unique monsters for the members of the Faerie (and Unseelie?) court(s?). Adapting the existing models (give the satyrs flower wreaths round their necks, giving the dryads flower crowns) could go a long way to making it feel different without too much effort.

Satyrs, Dryads, Hags, Pseudodragons, Will-o-wisp, sentient plants, there are already ok but creatures like Pixie and Sprite have never been in DDO, except in a small part of Party Crasher but they were one of those creatures that in DDO it was not very thorough according to me.

The Dragons then are a different thing from the Pseudo dragons, I would not mind to have them as a cosmetic pet even the Pixie and Sprite, I would pay 500-600 points DDO to have one of them that follows me ... apart from those rare cases in general, DDO's pets do not inspire me much, except bears, bears-owls, and wolves, the rest does not convince me at all.

For it to work well, you would need a decent storyline to link together a series of quests - and this would be the toughest part... coming up with Faerie related storylines that all players can accept and will want to play. The setting would allow for quests with good-aligned monsters who simply have different motivations from "regular folk" - they may be the antagonists of the story, but are not necessarily villains.

For me the most difficult art and even if you intend to create a mirror version of KingForest and Evening Star, the King Forest and an area too big to be able to re-sell, this implies additional costs that are then added with the addition of new quests and the development of the storyline.

PS: even if I agree with tea on the plot this in part for many and very subjective, most of the first players keep the audio of the DM turned off then do not even read the dialogue of the quests without understanding the story, so many a well-structured story does not interest much, just give him something more to farm to stay in the game.

Personally I love the plot of Ravenloft I think it is well structured and there is a good progression in history, I hope they do a similar job for future packs.