Calm down people for crying out loud.
1. The hacker/s MAY POSSIBLY have accessed this information (WE CANNOT RULE OUT THE POSSIBILITY).
2. Ironically something on this scale is safer for anyone who had their information compromised i.e. if a hacker successfully targets your computer then you are screwed, if a hacker gains access to the information of 70 MILLION users then even if he were to rob 1,000 people then that still leaves you with 99.9986% chance of not getting ripped off.
3. The hacker may not have gotten into the system on the hunt for such information (not that unreasonable considering how difficult it is SUPPOSED to be to get it), and so may have all this information that he has no idea of what to do with.
Sony are saying watch out for people ASKING YOU for information, not cancel your cards now. Still, many of you may now not think Sony a great source of information on online security...
Change your password, that should be only your PSN password unless you use the same password for various things (which you shouldn't).
Your info is 'out there' now, it probably already was out there for months only you didn't know about it. Admittedly perhaps not in such detail and in one such neat a package.
Having said all that I still say fuck Sony with a shoehorn. Absolutely dogshit security protocols, seriously. Nice to see they have called in some professionals at least.
Hackers will always hack for various reasons, I can sympathise some regional teddy bear store for fucking up with sensitive data like that, but Sony is a multi-national corporation. Too much money spent on lawyers and not enough on network technicians, fucking zero out of ten for effort.