I don't understand how all of you people come up with ideas of a new Fallout or it being a major talk about a DLC. The game just got out. With how things went, not smoothly I might remark, DOOM is the big bird they'll showcase to get back on the good tracks.
As far as this DLC talk is involved, there's a lot of speculation about an underwater theme park but I guess it'll be connected somehow to some Pre-War experience and the pseudo mafia presence in the game - what with all that you're a Military veteran, Valentine, the Triggermen, the VR longue, etc. And Irwin, I don't want to sound like an asshole but - I don't think it's a good idea that Obsidian gets to do anything Fallout related at the moment. With how things went somewhat south with New Vegas and the engines limitation at that time - now it's even worse. Work with something even worse with the same limited time schedule and ... you know what you get.