I'm not sure on how the normalmaps work myself, but I think that this new engine should support, well more everything if possible, meaning not just NIF's, but OB and Fo3 version Nifs, as well as .obj's and such. This also includes all the "texture extenders" such as normalmaps, glowmaps, proper bumpmaps, paralax maps, etc.
Remember: Code vs. Content.
Radiant AI-type features would be neat to have implemented as well, although again similar to the application of things such as normal maps it would be up to modders to utilize the features-and really I suppose all these features can only particularly be worked on once the engine itself is done and work can begin on some kind of variation on the CS (I'm not sure exactly how it'd work-likely the CS would have to either be coded from scratch, or the new features could be applied as a patch (hey, I rhymed!). I'm not entirely sure about the legality of making a patch that adds additional features to the CS would be, but I'd use the MW Code Patch as a precedent of sorts-although this would be a kinda different thing, though.
Also, stuff like normal mapping, seperate world spaces, Radiant AI, etc. that would ultimately exist for modders to utilize themselves in order to improve upon the game still have to be considered as they'd have to be implemented into the engine regardless of whether they're actually utilized by default.
So for instance a sitting animation and a feature that allows you to attach a property to an object that allows you to sit on it would be something that would have to be coded, for instance-although it may be nice to also have all chair objects preset to be sat on, at least by the player (scripting the NPCs to sit down on them could be added by modders).