Sadly, it seems like it will no longer be happening. The Xbox One version of Fallout 4 did get mod support a few months ago, but PlayStation 4 players are still waiting for the feature to come to their version of the game.
Before the release of Fallout 4 on PC and consoles, Bethesda confirmed that the console versions of their popular role playing game would be getting mod support, which is a first for both PlayStation 4 and Xbox One.