The suit, filed on behalf of Esther Leong of San Francisco, is seeking over 5 million in damages. The suit also goes on to specifically list the penalties for the late payment of fees, the interest charges for unpaid fees, charges that occur while the game account is suspended, termination of game service for unpaid fees, and the termination of game data due to the late payment of fees as the specific causes of this lawsuit.
In Square-Enix's defense, however, the suit also lists the standard monthly subscription as being intentionally decieving. Final Fantasy XI's case does, in fact, say that additional online fees would be required and it also has a large sticker announcing "Free subscription for 30 days!" on the front of the box -- something more than most online games provide regarding their subscriptions.
We have contacted Square-Enix, and are currently waiting for their response to this matter.