One of the major additions Bethesda is planning for Fallout 4 is the Creation Kit, a set of modding tools based on the same utilities the dev team used to make the game. Though people have already unsurprisingly found ways to mod Fallout 4 on PC, this will be Bethesda’s officially supported method (though they don’t seem to mind any other type of mod).
Until today we weren’t sure when this kit would be made available, but today Bethesda cleared that up. You can expect the Fallout 4 Creation Kit on PC this April, with a release for consoles rolling out a month later. Director Todd Howard delivered the news to Game Informer.
He also mentioned XBox One, for whatever reason, would get the Creation Kit first and the Playstation 4 would follow a month after that, so it will be June by the time every version of Fallout 4 is modable.