http://www.gameinformer.com/b/features/archive/2016/02/22/todd-howard-discusses-fallout-4-dlc-mods-amp-survival-mode.aspx. I found this passed around in a few other threads, but it really deserves its own thread. A few worthy quotes:
On the DLC: "
The first one Automatron has a little quest line and this Pokémon-esque ‘kill robots, get their parts, build your own’ [gameplay]. The robot building is really deep. It’s great.
The Wasteland Workshop DLC is obviously for Workshop people. We wanted it to scratch that itch of ‘Can I build my own Thunderdome?’ You can build your own arenas, capture animals, and also build other things.
A lot of people gravitate toward the larger ‘Okay, I’m going to a new landmass, it’s somewhere new.’ That’s Far Harbor. That costs more, takes us longer, and there’re more people on it."
On survival: "We’re doing things like you can’t save, it only saves your game when you sleep. You can’t fast travel. There’re all of these diseases. We’re trying it all. It’s a different experience. We’re not trying to make it a ton harder. It’s harder because you’re doing more things. We want the combat to feel different, as opposed to just being a bullet sponge."
On mod support: "Our goal is between the first two DLCs. It’ll go up at that time on PC. In April. All of that stuff will go up on PC. People are beta testing it. There’ll be a lag on consoles. We want to get it up on PC and have it work. It’ll probably be a good month before it hits Xbox One, and another month for PlayStation 4."