This was just posted on the Official Site moments ago:
Beginning at 4am PST on Tuesday, February 10th, all log-in servers will be undergoing maintenance. During this maintenance you will be unable to log in to all games and account management tools, and may be disconnected from the server if you are already logged in.
We expect this maintenance to take approximately 1 hour. We apologize for this interruption and will resume log-in services as soon as the maintenance is completed. Read on</p>
You can view this news post
here.