So they got in with a compromised FTP password
And then they pwned the place so bad it's not even funny any more. This seems to me to be a good step above skiddie level. This is serious criminal activity done by knowledgeable perps, and they're going to mint millions with it.
Big Corp might not get caught, but Mom & Pop operations are going to be sunk by this.
On the other hand : calling Sony ! Sony ? If you think you lost some money last time, when these guys show up on your doorstep, you're going to find out the true meaning of LOSSES.