I would like to know if interiors will not be seperated by loading screens.
And no I mean seperate rooms you have to load in a house you have just loaded. I hope interiors will have less loading screens as apparently we have open cities so I would love open interiors.
I just started fooling around with this idea in Oblivion's CS. I merged the basemants for 2 houses in Bruma into the cells of the main buildings (i.e. everything in Bradon Lirrian's Basemant is now in the cell that the main part of his house is in). I did that one to do some quest testing, and then merged Baenlin's basemant into his house. So far it works flawlessly but I specifically chose those two because there were no packages or quest related things in the parts I moved.
So having 1 cell for all the interiors of a specific city IS highly possible, but it would have to be built from the ground up to avoid massive amounts of gamebreaking bugs.
Edit: My next step was to try and merge something big, this time the Bruma Barracks into the Great Hall. Moving it was easy enough, as was adding pathing but several problems sprang up:
Unique Guards such as Burd merely stand in one place all day
The Countess and her staff (Bodyguard, steward, etc.) Now choose to eat in the Barracks area instead of the Great Hall
Guards never go to the barracks to sleep
Minor graphical glitches such as NPCs bouncing several feet into the air when getting out of chairs, chain lanterns bouncing.