Where do I start, I guess I'll list mods that would make my perfect game.

>------------------------------< - Armor and Weapons
Boba Fett
Jango Fett
Cad Bane
Storm Troopers
Rebels
>------------------------------< - Visual and Sounds
Realistic Star Wars SFX
Realistic Star Wars Visuals
Death Star in Sky
>------------------------------< - Player home
Slave 1
Millennium Falcon
>------------------------------< - Map
Star Destroyer interior
Death Star - Map
>------------------------------<
Randomly generated bounties - Missions
Randomly generated Jedi hunt - Missions
>------------------------------< - Miscellaneous 
Star Wars currency
Star wars music
Random patrols
Random bosses
Frostfall but for FO4

a jango fett mod would be nice especially if you could use both his pistols and the jet pack if that mod was real I would play non stop.

At the moment I am looking forward for some combat overhaul mods that will affect the actions that enemies will make during, before, and after combat. I have grown sick and tired of the bullet sponge/run towards the player characteristics of the game's combat.

Arbitration did a good job at changing the engagement distance between enemies with firearms and resolved some of my issues.

Nonetheless, I am looking forward to the potential tweaks that can be made for in game combat. And on a second note, I am hoping for a new iteration of Enclave Commander.

I want mods that restore elements from FONV back into FO4 but I guess that's probably not going to happen.

@Player147proman

Help, I can't stop staring at your signature.

Greatly looking forwards to a new monster mod. After far harbor is released I hope someone can add some bio-diversity to the waters, since they'll be new skeletons available. (no doubt whales will be released).

Second mod : more rpg elements. I'm not going to write up an essay on this, but take for example the track field the raiders converted into a race for robots. Wouldn't it be far more interesting if you could just walk-in, sit down, and observe the spectacle without no one trying to kill you? Maybe make the guy's day by enjoying the event, or placing a few bets? It's small things like this that make the world much more interesting, instead of a constant Rambo approach to every situation.

@"jesusp"  
Yes, Jango Fett's weapon would be amazing, I have a model of it on my PC. 

@"Limitlessness"
Combat overhauls would be great, I to find the run towards the player while holding a ranged weapon to be rather annoying. Would be interesting to see what they can do in terms of adding to the feel of combat. 

@"Player147proman"
What elements would you like to see From FNV brought into FO4?
 
And I thought of a few more:

I too would love a monster mod, would be nice to have variation. I would also like to see better movement animations, instead of that weird strafe jump animation I would like to see the side flip from Star Wars: Bounty Hunter. 

I would also like to be able to give helmets the upgrade options for Night Vision.

if learned how to rig models to fallout 4 this mod which i would pay if i had the money https://www.cgtrader.com/3d-models/character-people/woman/suicide-squad-harley-quinn-fan-artgame-character