Sony already released the PS3 with linux, and for those who DID NOT UPDATE they can still run their PS3s using linux. GeoHotz basically revealed an exploit that already existed, that Sony thought to lock down rather than actually recall and replace, like a responsible manufacturer would. Car manufacturers who find out the brakes on their latest model are defective reveal the brakes are defective and recall the cars - they don't just lock out the breaks and pretend everything is fine. All it takes is someone to unlock the brakes or someone to not get the patch, and the defective breaks remain an issue.
As for Anonymous - I doubt they are behind the latest series of hacks if personal information has been stolen. What would Anonymous do with personal information? The moment they attempted to use it any way, they'd get busted. Their normal tactics are to name and shame - so incriminating evidence, player logs, things like that, sure - and you can bet they'd be public somewhere if the gamers involved were doing something embarrassing and dodgy. Anything else isn't really their style at all.
The fact that they've been denying the PSN attacks, after having admitted to an initial wave, when they are the type of people who, despite being Anonymous, want you to know that it is Anonymous doing whatever they are doing and why, lead me to believe that Anonymous has no involvement. They know hurting gamers isn't going to help their cause, so they've stopped. Even though that were all for bringing down the PSN and getting stupid gamers off their Sony addiction to see the truth know that stealing from Gamers isn't going to help their cause.
Of course, it depends upon whether or not the details HAVE been stolen. I wouldn't put it past Anonymous to show how they MIGHT be stolen by someone else if Sony don't sort their shit out, because showing up Sony's incompetence and complete disregard for their customer's safety IS Anonymous' style.
Whatever is the case - you can be sure that Sony doesn't know, and if Anonymous IS involved, they would be telling everyone EXACTLY what they did. After all, what are the authorities going to do - try and arrest the Internet? There's a hell of a lot of lawsuits waiting in that regard, and with so much of the developed world's economy based on the Internet, there will be a global recession that will tank many nations. I don't see anybody in the developed world trying that any time soon...