We haven't heard what sort of DLC we can expect from this game. Now, we know it will get DLC, but what sort of plans the designers have we don't know yet, and I suspect they won't announce this until after the release. But looking at Bethesda's track record with DLC, we might note that the early Oblivion was were pretty basic, but over time, they got larger and more complex. Whereas we started with horse armor, we eventually got Knights of the Nine, and when Fallout 3 got its DLC, they all added new quests. Now of course, there were still those who found problems with these DLCs, but I certainly haven't heard anyone say that they'd rather have Horse Armor than the Pitt or something, so it seems to me that the kind of DLC we got with Fallout 3 was better recieved. Now, of course, the game is being developed by Obsidian, and I'm not sure if it's Obsidian or Bethesda who will decide what sort of DLC the game will recieve, but if it's Obsidian, then I'd expect them to look at what Bethesda has done with DLC in the past and the general response players had to this to get an idea of what would be a good direction to take, which I think means that if you liked Fallout 3's DLCs, then you'll probably approve of what New Vegas will get, but of course, I could be mistaken.
funny thing, i also prefer snacks. more variety
And yet a game can have both, as seen in Oblivion.
But honestly, most small scale DLC for games just isn't worth the price it costs if you ask me. And really, if you get a full expansion, though obviously it costs a lot more than a one hour long addon, chances are if you get enough DLC to offer the same amount of content, you'll end up paying a lot more. So with an expansion, since you get a large amount of content at one time.
Though if they still insist on not making a proper expansion, I hope that the downloadable content will at least be along the lines of Point Lookout rather than Operation Anchorage, as the latter felt like it was trying to turn Fallout 3 into a generic FPS, which really isn't a good direction to take the game in, as really, that's just not its strong point, not that I'm criticizing the combat of Fallout 3, for the type of game it is, the combat mechanics were satisfactory to me. But it's not what makes the game what it is. Combat isn't all there is to a game like Fallout 3. Sure, combat is a part of it, but the game can't set itself apart from competition on that alone. Ultimately, I felt that DLCs like Operation Anchorage failed to capture what the game should be about. Now Point Lookout, on the other hand, gave the player a new open area to explore, complete with new enemies, new items, new quests, new characters, and so on. And it seemed to follow the same design philosophy as the original game, just on a much smaller scale, and in a different environment. I still didn't like it as much as Shivering Isles or Bloodmoon since it just did not offer as much, but if Bethesda sees DLC as the way of the future rather than expansions, then this is the way I want DLC to be made.