I've mostly answered all I could in the previous asks (under the #swtorween 2025 tag), so there's not much left to discuss! But I will talk about beta ideas.
Besides being an obvious ghost story with a selection of restless spirits, depending on your class, you would be haunted quite literally by some of your past. The Manor would reveal these to you and constantly have the player question what it means to be them, past their mortal shell and their own physicality. Who are you when you're alone? When you're robbed of your strength, your deeds, your power? What is your place in the world--or are you too just a vengeful wraith powered by purpose and the burdens others have placed on you?
Most of this would manifest as flavor text. Little observations made by the player class, though this too mostly sticks to one interpretation of the SWTOR classes since I would probably explode if I had to write both Light and Dark versions of say, a Bounty Hunter.
The Manor was intended to become a deeper, darker twisting maze that could change itself at will, though ultimately the PC didn't descend very far into its depths. (Quite a few people missed the hidden mouseover hint telling you how to solve a certain puzzle too, so more elaborate trappings may have backfired lol).