Fallout 4 mods will be shared across both the PC and the Xbox One release, the game’s director Todd Howard announced at Microsoft’s E3 2015 press conference.
Howard didn’t take the time to explain exactly how it’ll work, but he did say he’s been wanting this feature to happen for a while.
There’s a huge community still adding game changing mods to the previous game, Fallout 3, with some that completely change how the game looks. I’m a little skeptical about how big mods like that will work on Xbox One. Maybe we’ll see a subset of PC mods also available on Xbox One. But for that, we’re probably going to have to wait until we’re closer to the game’s November 10 release.