Uncle Phosgene
First time out of the vault
A lot of my attempts to research this stuff have put everything into one pile, which means stuff that never left the concept art stage is lumped in with stuff that's basically in the game and just broken or missing one thing.
Like on a sliding scale. On one end stuff that's basically in the game and just needs some scripting fixes to trigger properly. On the other hand stuff cut in the concept stage we barely know about. In between that would be stuff that's mostly finished, but needs some extra content, stuff with significant remnants in the game, but huge chunks missing, stuff with minor remnants in the game and we don't fully know about it, stuff cut before development but with a lot of art and concept fleshing, and stuff basically pitched as an idea and abandoned.
Like on a sliding scale. On one end stuff that's basically in the game and just needs some scripting fixes to trigger properly. On the other hand stuff cut in the concept stage we barely know about. In between that would be stuff that's mostly finished, but needs some extra content, stuff with significant remnants in the game, but huge chunks missing, stuff with minor remnants in the game and we don't fully know about it, stuff cut before development but with a lot of art and concept fleshing, and stuff basically pitched as an idea and abandoned.