The Knight's Dungeon, the Inner Sanctum (Temple of the dead), the Druid Dungeon(Alchemist) were originally all part of the mega dungeon but when we realised we were never going to make it at the density level we aspired to, we decided to modify their function. We have the other parts of the dungeons on our HDDs but they're not that much fun so we decided not to include them. As I said before, it's a game, not a shopping list and "Killing your darlings" is an inevitable part of any production as is shifting priorities.
I think there's more than sufficient content in D:OS as is. There certainly is more than we planned for and I hope people do realise just exactly how easy it would be to construct a few extra boring dungeon levels just for the sake to living up to the "letter of the law". Or maybe we could have cut up some of the existing dungeons and split them in different levels. We opted not to do that because we thought it'd deteriorate the game and tbh, didn't consider it a big deal. A lot these resource shifts had to do with implementing other feedback we got during the beta which we thought was more important. You may agree or disagree with that, but it's one of those things developers sometimes have to do. I certainly don't regret making other areas more dense and adding more freedom at the expense of these dungeon levels.
-> post by Swen himself from
http://www.larian.com/forums/ubbthreads.php?ubb=showflat&Number=513527
