Blizzard has emerged (mostly) victorious in the case of Bell v. Blizzard Entertainment, which was filed in response to the Battle.net security breach last sumer. Though no financial data was taken, the lawsuit claimed the data breach harmed customers and targeted authenticators, which it said were required for players to have "even minimal protection for their sensitive personal, private, and financial data." From the beginning, Blizzard has said that the suit was without merit, and the court has dismissed 6 of the lawsuit's 8 claims, saying that the plaintiffs failed to to prove that they were harmed by the data breach and that Blizzard did not misrepresent its security practices.
The part of the lawsuit that moves forward relates to Blizzard failing to fully disclose the importance of an authenticator to users, though Blizzard is certain to continue the fight. As in most legal battles, the situation is more complicated than can be explained in a couple of paragraphs: if you're interested in digging further, you can read the full text of the complaint or legal analysis by Mayer-Brown.