Id like to see some new DLC but this games done for that. I think to see DLC come out a year and a half later isnt a bad thing it just never happens since most DLC packs are rleased within the 1st year. I would have liked to see a DLC that involved super mutants, all the packs were some form of "human" enemy. Now ill just keep waiting for 4 to come out
Once a game is re-released like "game of the year edition", or Fallout: New Vegas Ultimate Edition, which typically has all the DLC's up to that point included in it. It's safe to assume that there won't be any futher dlc's for that game.
I'd have liked to see some kind of Area 51 or something like that. Kinda like Dead Money where you're stuck inside the area until you're done with the whole quest and then you can't get back in. I think it would be fun to see a huge military base with top secret planes/weapons/prob a few aliens or some kind of Extra Terrestrial reference