All of the above. Plus: the ability to place the stair railing in any position, left, right, or center when stairs are wide enough for that to make sense (TS2 has this), spirial stairs (again asking), proper Mansard roof sections, water tool, the terrain tools we do have work in a more intuitive manner (TS2 does this right as well), fireplaces that generate their own real chimneys, a better selection of carpets, more accurate classification of wall tiles - a painted or wallpaper one with wood trim on top and/or the bottom is NOT a paneled wall.