Bethesda has sent out dozens of Beta invites to Xbox players that opted in the Closed Beta for Fallout 4 Mods. The game was patched to support Xbox Modding a week ago. Mod support for Fallout 4 was added for the PC version of the game in April this year. Unofficially, the Mods for the game have existed since the launch day.
Previously, Bethesda has revealed the plans to release Mods on Xbox in May and on PS 4 in June.