BioWare is planning DLC for Dragon Age Origins to stretch out over the next two years. Executive producer Mark Darrah, who said the DLC will include small things like "item packs," as well as "larger quests that might last an hour or two, up to even fully fledged expansion packs."
Darrah expects that the DLC will make it onto all platforms, except for the mods toolset, which will likely be PC-only. Joystiq will maintain cautious optimism about Dragon Age DLC until BioWare brings the goods to market. The developer is lucky that Mass Effect took place in space, because the lack of DLC (support and testing) certainly made them want to scream.