Although we are still investigating the details of this incident, we believe that an unauthorized person has obtained the following information that you provided: name, address (city, state, zip), country, email address, birthdate, PlayStation Network/Qriocity password and login, and handle/PSN online ID. It is also possible that your profile data, including purchase history and billing address (city, state, zip), and your PlayStation Network/Qriocity password security answers may have been obtained.
In other words, Sony’s security systems totally failed and all your account details are now in the hands of hackers. I know some people still don’t trust me after the “I’m leaving” joke, but this is real.
ArsTechnica goes on to say:
Sony is still unsure about whether your credit card data is safe. [...] There is still no update on when service will be restored, but that is the least of your concerns if you have a PlayStation Network account. It’s time to change your passwords, at the very least, and if you’re like to be completely safe it’s not a bad idea to cancel your credit or debit cards and request replacements.