Mods will come to the Xbox One version of Fallout 4
Bethesda have also announced there will be a 2GB download limit and that while playing a mod you cannot earn any achievements. As a sort of failsafe, Fallout 4 will create a new save when you are playing with a mod. This is so if the game has an issue and crashes, you can just go back to your original saved game without losing any progress.
Mods will be found in the game’s main menu and after linking your Bethesda account, you can browse all the available ones to download. If you cannot wait until the 31st, you can start looking at the mods now here.