Mod support will come to the PC version of Fallout 4 this April, with console support to follow some time later.
There are already a bunch of Fallout 4 mods out in the wild: some are useful tweaks, and others are just random cool things. Despite this, Fallout 4's official mod creation kit, the G.E.C.K, still has not been released. That's all set to change in just a few short months, as Bethesda's Todd Howard has announced that mod tools will hit the PC version of FO4 this April.
"[Mod Support] will go up at that time on PC. In April," said Howard in an interview with Game Informer. He added that there would be some "lag" between the PC and console release of the mod tools, stating that "It'll probably be a good month before it hits Xbox One, and another month for PlayStation 4."
Considering the caliber and quality of mods that are already out there, I'm really excited to see what the modding community can dream up once official mod support hits.
In his interview, Howard also talked about the game's upcoming free "Survival Mode" update. "Survival mode has a lot of changes that can be pretty dramatic. Once we get it honed where it's working well enough, we're going to put it on Steam beta for a while. 'Here it is. Start playing it. Give us feedback.' It's far easier to update and iterate on [PC]. Once we settle on it, then we'll release it for PlayStation 4 and Xbox One."
While Howard said that it wouldn't be "months and months" before we see Survival Mode, he neglected to offer any sort of release window.
Source: Game Informer