Ultimate Edition has DLC stuff in it (according to Steam: Dragon Age: Origins - Ultimate Edition includes Dragon Age: Origins, Dragon Age: Origins - Awakening and all nine content packs.).
http://store.steampowered.com/app/47810/?cc=us if you want to browse the store.
Also, for those buying the game, don't forget that Bioware gave away all the pre-order DLC for free for all versions of Dragon Age, DA: Awakening and Dragon Age II. All you have to do is register your account's email address on the site and create your in game account with that same email address:
http://social.bioware.com/da2/dlc_bundle/
It works for all the platforms as well. PC, 360 and PS3.