I am making this post for people to talk about what they think FO4 DLCs will be about or what they would like to see in a FO4 DLC.
I have this idea that we will see a Moon related DLC, where the Main Character will travel to the moon for some reason and explore a moon base of some kind, and will fight new enemies (possible Aliens, Chinese or even maybe Russians).
Now you might be thinking from where did I came of with such weird idea. It is all because in FO4 there is a mural depicting major battles that the USA fought and there is a moon battle in that mural... Why would Bethesda include a moon battle when never in any other Fallout game or lore was mentioned anything close to the USA having a moon battle, why would be the point of making something like that come out of the blue and for no reason at all? Not even FO4 tells us anything about it, and it certainly seems like a Bethesda easter egg for future content if you ask me.
Mural Picture courtesy of TrickyVein: