Since the settings of Rivellon and the Sword coast both have European-Plains&Seas&Mountains-medieval art (and that´s all they have in common) I fail to see why they should waste the time of designers and animators to recreate new models and textures for walls, rocks and brushes if they have them already;
Actually, about 3/4 of the game engine was updated or rewritten, and in addition to graphics quality improvements, there were also some changes to file formats used to make assets easier to manage, etc. I'm not sure about the basic textures, but no models / icons / characters / etc are being reused* (textures would at least be looked at for quality vs size; as mentioned, even if entirely new a texture of a common rock is going to be relatively similar to an old texture of a common rock).
* Obviously during development there were a lot of placholder and reused assets, replaced as development progressed.
You should really label this message as "important" and use it as a banner of the forum. And share it in RPG codex and steam forums too.
