I'm personally lobbying for a "Lore Pack" which would introduce some new quests, equipment, goodie huts and items to the world.
If you are aiming at the purchaseable dlc, it would be better from my perspective if you were trying to make the more difficult parts of the game to mod in, like new items are hard to find skins for, new monsters are also hard to find skins for, etc.
Making a pack full of premade maps kind of to me seems a rather bland dlc, and any sillyhead with enough time to bother with the buggy map editor could publish a similar but free mod.
That said, I am happy people enjoy the premade maps
Sincerely
~ Kongdej