There are a few key things I really want Bethesda to work in all of the next gen games they make which most likely Fallout 4 will be first.

Biggest is facial animation. They need to work on that alot since a massive amount of the game is talking to people and when the faces are so lifeless like in Fallout or Skyrim it kinda takes you out of the story side of the game.

Overall character animation is a close second. Skyrim improved in a small way some of the animation issues but not to much. I mean the rolling animation in Skyrim is so bad it makes me laugh.

As far as graphics I expect them to be great but kinda like how Oblivion was versus being insane OMG level stuff. What I mean by that is that when Oblivion came out at the beginning of this gen it was crazy looking and people were kinda blown away but obviously they pushed it even harder with Skyrim which looks MUCH better. So i expect it to look awesome but that the next Elder Scrolls or Fallout 5 will be that much better.

One other thing which isn't as big a deal is that I would like the game to be far more dense. At least as far as finding things to explore goes. It's alot more fun when every few minutes you are finding a new place to explore instead of wandering around(which can be fun to sometimes depending on what beasties you run into)