So I follow game development quite heavily and like watching videos of in progress work and explanations of how things work. To that extent, I realize that this would be extremely hard to incorporate - maybe even impossible. The feature I am suggesting is no loading screens when you walk into delves and dungeons, and even better: between zones. Please don't jump down my throat saying how hard it would be: I understand. I also know that other people have mentioned this too. All I am saying is that it would be super cool to be able to walk around and between zones with no loading screens, and have the door to a house open and just walk through it. Obviously we would need them for wayshrines, etc. but examples like being able to climb up a ladder into the bright sun would be a really cool thing to see, and add insane immersion, not to mention add to the overall Elder Scrolls feel.
They could do this by having a zone system where the engine only loads in what you are currently able to see, as well as some of the surrounding area. It could then stream in new assets and environments as you move around, instead of loading it all in one big chunk. I am not really expecting this to ever be the case, but it would be amazing to see it added.
Also, higher view distance in some areas would be great. I realize that fog is purposely put in place for some places, but it is not necessary everywhere and it was said that ZOS was working on a view distance upgrade ages ago.