delericho
Legend
But the codename for SKT was "Dagger". So they're not always that close.
True. But then, it's just a guess.

But the codename for SKT was "Dagger". So they're not always that close.
The Dancing Hut of Baba Yaga (both an artifact in the 1e DMG, a classic Dragon adventure, and a 2e adventure module) has a pretty good provenance, it relates to hags which got featured in Volo's Guide, and in 4e it was related directly to the Feywild. I think that's the "in" if they choose to do a Feywild adventure.As neither Pathfinder nor D&D has done a Feywild adventure, I'd love that so much. But won't happen as it‘s not possible to do as a revamp of a classic adventure.
It's a given they're going to do something with the Tomb of Horrors eventually.True. But then, it's just a guess.
That would be a way to go full feywild while still updating a classic. Not quite what I'd like, as it seems more forced to be feywild than being a story you can only tell in the feywild, like something with fomarians or the Fey CourtsThe Dancing Hut of Baba Yaga (both an artifact in the 1e DMG, a classic Dragon adventure, and a 2e adventure module) has a pretty good provenance, it relates to hags which got featured in Volo's Guide, and in 4e it was related directly to the Feywild. I think that's the "in" if they choose to do a Feywild adventure.
I think it's too early to early to look for patterns in their release schedule. So far there haven't been any.My specific guess is that the spring releases will continue to be the "non-Forgotten Realms" adventures, and this spring another setting will be visited. This is also how they release settings for the DM's Guild, so there is a good chance it will be something different from Greyhawk.
Maybe.The 2016 D&D Open featured the 'resurrection' of Hallaster. I get the feeling he's only just beginning..
There's references to pretty much all the settings dotted around the core rulebooks.
There's some nice stuff about the Wind Dukes and the Rod of Seven Parts in the MM, and also in the DMG. I wonder if we might get a Rod of 7 Parts adventure at some point.
Do note that the OP did attempt to narrow things down - he specifically talks about "green boxes" onlyThe problem with the "clues in the Core Rulebooks" is that there's a reference to every adventure or setting somewhere. There's bits of lore teased every other monster entry. There's too many clues to narrow things down.
It's a given they're going to do something with the Tomb of Horrors eventually.
The tricky thing is that's not much of a clue. The Tomb is 20-pages of adventure. Even if they expand the pages given by 50% that's still a tenth of the pages they need to fill a book. And it's at the end. What's going on before? What takes the characters from level 1 to Acererak killing levels (not that you'll *ever* be able to hit a level where you reasonably face a demilich in a fair fight in these modules).
At 160 pages, it's 60% of a 5e book.Bear in mind that they've done a version of the Tomb in every edition of the game, mostly considerably expanded from the original. The 4e version, in particular, wasn't far from the length of a 4e storyline book.
Dunno what they'd do for a Tomb of Horrors that starts at level 5 and goes to level 10-14. Let alone fighting a CR 18 demilich in its lair at level 14.