Square-Enix posted the following notice as an update:
As a result of our continuing investigation, we have now confirmed that the database in which we store personal information was NOT accessed during the recent server intrusion. Therefore, your personal information was NOT compromised by an unknown third party.
Square-Enix is planning to restart the Square Enix Members service by the end of December. Details of the schedule will be announced at a later date.
We deeply regret any inconvenience this may have caused our customers and fans, and appreciate your patience.