5. Are the art assets we are currently seeing for environmental objects such as walls, cobblestones, pillars, etc. final versions, or will they eventually be replaced with assets created specifically for this game?
Raze actually responded to this general question in another thread last night:
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 placeholder and reused assets, replaced as development progressed.
Early Access will give people a better look at the gameworld. If some still think it 'looks' like D:OS 2 after that, the actual assets being different probably won't matter.