Well I am going by pre-FO3 wasteland and LA was gone along with every other city. It would be cool to be walking in ruins and look down and notice that some stones have stars on them. Easter Eggs could be names of people that have stars on the walk of fame.
I like that idea. And personally, if we want to get a truly amazing DLC, then we need to COMPLETELY forget that FO 3 ever happened. EVER. Not to burst the bubbles of many of the people on this forum, but, Fallout 3 was not Fallout. That may sound a little idiotic at first but with all factors considered Fallout 3 was little to nothing like the first two. The main issue being that 3 didnt do nearly as good a job of creating an atmosphere that presented you with the faults of man, and the horrors of nuclear war than the previous two did. A bunch of half destroyed buildings and broken down roads doesnt do that, hell, the landscape of FO 3 looked more like LA after a large earthquake. Another problem with 3 was that not only did it not capture a feel for the pre war worlds mistakes, it didnt have the creppy 1950s feel WITH the previous atmosphere.
But, out of all the issues I had with three, the biggest one was how it tricked itself into thinking it was smart. It THOUGHT it was presenting you with a world in ruins that, weather you realize it or not, was a lot like ours. I dont know about you, but when I see a bunch of age old robots, still going about there work, as if nothing had ever happend, it frightens me a little bit. There not even malfunctioning, well, I know I'm not doing a very good job of explaining it but....okay just go read "There Will Come Soft Rains" by Ray Bradbury. I want the game to give me the feel that that story gives me.