"Users who have yet to enter their registration codes will receive an additional seven-day trial should they register before 11.59 pm (PDT) on September 9, 2013." Square Enix said in a statement. "Moving forward, we will continue monitoring the servers to ensure that quality service and support are provided in a timely manner."
The servers will be taken down tonight at 8pm EDT with an expected downtime of 10 hours. This downtime will introduce new Worlds to increase the number of concurrent logins allowed for each server.