Improved movement and animations. Started replaying it recently out of boredom, and it was the first and largest flaw I noticed, and is really such a shame since it makes a big negative impact on an otherwise enjoyable open exploration based game.

the games engine can't handle it next FO maibe

This isn't capable with the Games Bryo engine. However it is with the Creation engine, so if Fallout 4 is to use the creation engine then you will definitely see improvements.

first person helps, npcs arent nearly as bad as the pc

You don't do stuff like that with DLC.

as several people have stated above the engine simply can't handle better animations obsidion tweaked the hell out of the engine to get better animations than were in 3 fourtunatley the creation engine develop by bethesda to replace the worn out gamebryo engine looks and from what little we've heard sounds to be a whole lot better in terms of everything and I'll be anything thats whats going to be used in fallout 4

what bothers the most is that there is only one body type available, really there are refugees who all starving and all have perfect body.
no fat people ect.