Corinnguard
Hero
How about a Fiend Folio for 5e?
I know, that's what got me inspired to put it on the official WotC list. 3E had such a book officially (and many unofficially). It's not that I need it right now, but I do prefer official over third party in this case (due to how my players work). I might still buy this at a later time as a pdf though when it's released and there are a few reviews out in the wild.There is a Kickstarter that has you covered: GOD RULES A Player's Guide to Gods in 5e
I've seen a fan create a Faerun globe map that planted the Radiant citadel locations in the unexplored continents like Osse and Katashaka and the many islands in those regions. I liked that.Campaign-wise, I would love to see Spelljammer, Eberron, or Ravenloft.
Setting-wise, if not something entirely new, I'd like for some of the Radiant Citadel worlds to get a full treatment (maybe like the FR campaign book, a deep dive on 5 of them?). Also would love to see the Feywild and Domains of Delight.
Character-options wise, as many subclasses as possible, of course. I'd also love WotC's take on a Witch class, since new classes appear to be on the table.
Finally, gimme a Manual of the Planes, dammit.