Alrighty, I figure some of you are going to purchase this thing and I was given some early codes. Since I have no plans to buy the game I figured someone here might like them. These codes allow you to earn Double XP by associating them with your account. I do not know how long the codes allow you to gain Double XP, but I do know you can stack them and they also count in some type of contest.
Here is the XP RANK Up Site:
http://www.rankupxp.com/
Here are the 2 codes I have:
M77B344NVN
WZLLLCNALL
These are first come, first serve.
Keep an eye out for Mt. Dew products that give you these codes as well if you want more time or want to give them to friends.