A huuuuge wolrd where I will atleast have to put in 300+ hours to have seen and discovered every place on the map
More quests, like WAY more. And better quest design --> more interesting quests that will stay in your mind for long.
Don't make the map to cramped. This is what I didn't like the most about Skyrim. Everything felt so close, there was no real feel of distance in it. I like it when you have to actually have to travel a little in barren wasteland between two marked locations. i think Oblibion did it best.
Have more voice-actors.
Don't make any drastic changes to the UI or overall gameplay. I don't want a Skyrim 2.0 in terms of casualization. I want my weapons to degrade over time because that makes me wanna collect them instead of keeping them on the ground. In Skyrim I never had more than 1 sword of the same type in my weapons chest because they all had same stats anyways...scrap that please....it svcked. Removing the ability to repair your gear straight out svcked imo.
Give me a big crowded city and don't make it feel unrealistic. I'm talking to you again Skyrim. I didn't like the "everything is 1/10th of the real-world size" concept. I wanna have a scale of 1:1 or at least something that is more plausible.
For the love of god, please don't make this stupid rumour true that you can only play as a male character. I highly doubt it but it still gave me some shivers that there might not be any character customization in a BETHESDA GAME.
I like the idea with giving the protagonist a voice, but please offer me a choice. I want to decide if I want it like that or how it was before. If you can't do that at launch then please add it with a patch asap.
Please don't make the game too easy. Don't give me like hundreds of hints and pop-ups about where I have to go. I don't wanna follow a damn marker all the time, I mean it's ok for the most part but I sometimes also wanna be challenged. Example: You find an audio-log which plays a tune that will tell you about a location for a quest item which you have to find, but there won't be a particular quest marker which is pointing directly at that damn thing. I wanna go and explore that area to find it myself and listen to the hints that were dropped.
All these points are not game-breaking for me but I do would be a little upset if some of them don't make it in the game.