* Graphics updates with shaders for improved water and fog (which you can combine with much higher view distance), godrays, HDR, etc, improved meshes, improved grass, high resolution textures with normal maps and PBR.
* Modernized UIs
* Multi-mark (extra marks as you level mysticism)
* Turn the books into audiobooks and add full voice acting if you're a mild heathen.
* Combat and leveling system overhauls if you're a full heathen.
I played it a year ago. To my surprise, in some ways, the advanced graphics broke my immersion. Standing in Vivec and expanding the render distance to Seyda Neen takes away part of the mystery.
I had the same with Gothic, where my more powerfull computer could render Xardas' tower when standing in the old camp.
Both games partially depend on limited render distance to provide an illusion of vastness.
* Graphics updates with shaders for improved water and fog (which you can combine with much higher view distance), godrays, HDR, etc, improved meshes, improved grass, high resolution textures with normal maps and PBR.
* Modernized UIs
* Multi-mark (extra marks as you level mysticism)
* Turn the books into audiobooks and add full voice acting if you're a mild heathen.
* Combat and leveling system overhauls if you're a full heathen.
https://youtube.com/watch?v=iFZm4VZnHy0
https://youtube.com/watch?v=9Hv-46CCd9I
https://modding-openmw.com/