Quote Originally Posted by Originally Posted by SE PRE-ORDER E-MAIL
Your early access code is now active and can be redeemed to receive the exclusive pre-order in-game items, Baron Circlet, Baron Earrings and Chocobo Chick Courier, via the Moogle Delivery service in-game mail system when official service begins.

For pre-orders of FINAL FANTASY XIV: Heavensward, you will be able to gain early access to the game servers ahead of launch. Early access is not available for pre-orders of the FINAL FANTASY XIV Online All in One bundle.

Your early access code: xxxx-xxxx-xxxx

This email was sent to everyone I think. I ordered the Windows PC copy, and I got another email today saying my code was "active" even though I redeemed mine weeks ago.
I'm fairly certain its just a reminder email for everyone. In this case it just happens that PS4 users are finally getting theirs it seems?