D&D 5E Which three topics do you most want to receive official (WotC) treatment?

[Eltab]

Clothes. Particularly cloaks. I want a full book dedicated to mundane clothes. That way when my players ask to buy a cloak I know exactly what cloaks are available, their cost, and weight.

In addition to the low low cost of picking a Criminal background, we will throw in a hooded cloak for free!

 

[Lanefan]

In addition to the low low cost of picking a Criminal background, we will throw in a hooded cloak for free!

But wait, there's more!

Call within the next ten minutes and you'll also get a FREE dagger! That's right, a FREE cloak and dagger just for ordering your Criminal background RIGHT NOW!

The number to call is 1-800-ENWORLD. That's 1-800-ENWORLD! Operators are standing by!

 

[Iry]

Planes - Sigil is cute, but I really want some Bytopia, Mechanus, and Abyss locations.

Dark Sun - Not for the Psionics, but just to have rocking post apocalyptic fantasy Mad Max action.

Ravenloft - Some dread domains to be sure, but fold this into a whole book about the Shadowfell and the Raven Queen.

 

[Fenris-77]

I think it might makes more sense to call it a Shadowfell book, and cover the Ravenloft content as part of that book. Call it the creeping horror setting. I'd love to see more about the Raven Queen. If you combine dark Fae with some horror rules I think you have a very marketable product.