User blog comment:Equillibrium/The Elder Scrolls Online on PS4: Questions Answered/@comment-70.112.240.21-20140131000405/@comment-72.171.16.62-20140202075350

"the Imperial Edition for $99.99/€99.99/£89.99, which, in addition to the base game, include's exclusive digital content, vanity items, and the ability to play as an Imperial for any faction."

You can't be a dark elf in the Dominion only the Imperial race can join any faction.