We won't have expansions, typcially they do add landmasses quests, content, items. DLC's add landmasses also, but not to the existing world but beth stated they will not be doing Expansion packs anymore, It is a statement I wish they made a 180 on like they did the We have no plans to make modding availible on the Consoles if you want modding we suggest you buy the PC.
they didn't say they were not doing any more expansions, they said they were not going to do big ones like SI, which I intrept to mean the DLC will not be adding any landmass, but will be adding things along the line of KoN style content. I guess it means more DLC's that add more weapons and armor and other content, but I really am not pleased by any news I am hearing about the map and the possibility of expanded landmass.
btw, that last part, did they say that they will be bringing modded content to consoles some time receantly? that what I intrepreted that last part to mean.