So... from what i've seen, (in the GFX and SFX files) there are:
-28 New Rooms (including mapend.x and mapending.x which are for the ending, mapnothing.x, still unknown what it is for me, stairs.x and stairs2.x, also unknown what it is for me, but by the name it must be an type of staircase, act_maze.x, elevator.x, ending.x and ending2.x. The rest are new mapNUMBER.x)
-New Textures (3 to be exact, excluding the new SCP-087-B instances' textures)
-2 New SCP-087-B Instances (087-B-4, i call them the Lost/Cheshire Face:
And 087-B-5 the Eyekiller, this name came from the actual texture file name for this instance:
Currently, no in-game screenshot for this instance)
-Alot of new sounds were added (28 in the original version and 55 in the extended, thus, 55 minus the 28 original sounds equals to 27 new sounds
-New Events and an extended Ending. Also the intro is better in my opinion. The ideia of removing the creepy ambiance from the beggining and adding it after the event on the Floor 6 washttps://www.youtube.com/watch?v=dnAYgNnA5A0
Basically, this mod/expansion is 10/10 + 1 = 11/10! Should really get more attention!
Notify me if there is something else or if something is wrong.
This list is for V2. If an V3 comes out, i may update the list (if i remember this exists