Mods. What do you think of them?
I think we can base ourselves on Skyrim to know what kind of mods will appear for Fallout 4.
Mod fixes with better UI's and compatibility will happen. Those are good.
Mods with better graphics will happen. Those are either good or doesn't work on your pc. Which is better than nothing.
Other various mods for hardcoe mode and such will happen. Those are also good.
Mods with more weapons and armors will happen. They are almost all crap in my opinion.
Mods with more monsters will happen. Those are also usually [censored], almost all of them. Always some out of theme monster n crap.
Some guy claiming to seek balance will create a "balance" mod which will, as usual, make your character so powerful the game will be too easy. Those are also crap.
Pretty much, we will get good "patching" mods and the rest will be [censored].