It sounds like a single castle they plopped into the game world, and its main features are new little things like storage and a new armor set.
It sounds like add-on content to me, not real story content.
You can disagree... the point is the main game is not lacking content in any way and also has massive mod tools. The game looks to be an absolute steal for $50.
I don't think that anyone disagrees with that, We just dont think that theres any room for day 0 content that could A: Be free, B: Ship on the disk.
I could sort of understand putting people to work on new content between the time that it goes gold and release but even then they usually have vacation time after that happens. But even so they would not have much time to do such. I'm willing to bet that there is a placemat for the DLC already, be it a locked door or what ever.