This taken from the FAQ...
- What comes with the Digital Standard Edition?This edition provides the full game and unlimited access to it for 30 days. If players pre-purchase the Digital Standard Edition on The Elder Scrolls Online Store , they'll receive five days of early access to the game and the Explorer's Pack.
Now, if it's full game and unlimited access why will imperials be locked? There is no doubt that the Imperial Race is locked, you can even see it when creating a character. That would make the answer to the question a false statement would it not? I know some of you consider it a bonus or reward, but it is content. All MMOs have different races/classes, that is main content for the game.