What was in that pdf file you guys got?
A link and a letter, here is a copy of the PDF.
Instructions to sign up for early access to the game:
Visit http://preorder.na.finalfantasyxiv.com and register. You will be notified via email prior to the launch of the game on when you can return and redeem your preorder code to unlock Early Access to the game along with instructions on how to receive your Cait Sith Doll minion and Moogle Cap digital content. You will need an active Square Enix account to complete this process so, if you want to set one up in advance, please go here: http://na.square-enix.com/members.
You can plug that web address in, if you want and see for yourself.