Was on my Battle.Net account last night and found Warlords of Draenor client in my "download client games" section, was amazed that i can download it straight from blizzard!
Spoke to a GM today on retail and told him what happened and he replied with: " That wasn't supposed to happen so soon."
Than told me to remove it etc.
Heres the pics: v
A full guide on how to download the client are on the forums: