I got an email around when early access started saying that my pre-ordered game was available, and it came with links on how to set up the early access. Below that I found the code for the game under Digital Rights.

Email subject: Square-Enix, Inc. - Product Now Available (Order #***********)
From: webhelp.v4@digitalriver.com
Body: Dear ***********,

Thank you for ordering on Square-Enix, Inc.. The product that you preordered is now available.

Order ID: ***********
Product ID: *********
Product Name: FINAL FANTASY XIV: A Realm Reborn [PC DOWNLOAD]
Release Date: August 27, 2013

ffxivsetup.exe
http://wgt.digitalriver.com/wgt/9B5A...ffxivsetup.exe

Final_Fantasy_XIV_Early_Access_Instructions.pdf
http://wgtot44.digitalriver.com/wgt/...structions.pdf



Digital Rights: ****-****-****-****-****
******-***-******-***(This is where the codes for regular play are)


If you have questions about your order, please visit: store.na.square-enix.com/orders

Please note: This email message was sent from a notification-only address that cannot accept incoming email. Please do not reply to this message.

Sincerely,
Square-Enix, Inc. Customer Service
store.na.square-enix.com/orders

Hope this helps.