Hey guys not so much when it's going to happen, but Pete was interviewed by Gamespot and expressed that the company is still interested in the idea of monetising paid mods. I think this is the first time since it happened in April that we've heard this.
The jist of the video is Bethesda are still interested but with Fallout 4 coming they're not actively working on it again right now.
https://youtu.be/Mz92C4YZ2_U