I purchased this recently and while I understand that Helm's Deep hasn't dropped yet, I was curious if there were keys, etc. for the Expansion Quad Pack that would be sent before the drop of HD?

It is my understanding that the expansion packs are digital downloads and would thus would require key(s)?

Obviously, I am new to this whole process and while I did sift through a bunch of posts, I didn't find this particular question.

Thank you