I'd like to see features like leaning, taking cover in third person (kind of like gears of war) and first and third person animations when taking chems.
(Similar to the solid project mod when you inject a stimpak or take jet)
I think that simple features like these could attract more people to the franchise, and they could boast these as being new features in the game engine.
What are some things that you would like to see for the future of Fallout?