"We are assessing the full extent of this potential breach to determine what data, if any, was compromised and will provide more details as soon as possible," Square Enix stated. "While some personal information may have been accessed, we can confirm that there is no possibility of any credit card information leak from this incident, since the server in question stores no credit card information." The company will investigate the breach over the next "few days."
The good news is that your credit card info is safe. The bad news is that somebody out there may know that you bought Mindjack.