I have a few friends who seemed (and still are, they don't follow news) to be 100% sure that a campaign editor was coming. after our Coop endet it was "goodbye, we're starting a new one as soon as the editor is out". They apparently expect one since DOS2 came with one and it was sort of a "given" BG3 would be the same, being so close to DOS engine-wise (at least to the layman's view).
I personally had no money in it, I used to loooove doing my campaigns and multiplayer areas in NWN(2) and miss those times badly, but didn't know DoS had the same capabilities and was just excited on being told that BG3 would "absolutely get that Editor too", so I'm a bit disappointed but I know quite a few people who will be absolutey dumbfunded on learning this, they probably already planned their custom campaigns from start to finish.