Are they being paid by a third-party to continually hack Sony? I'v not seen anything proving this is organized through a profitted group. Until there is proof that a group is being contracted to attack Sony, they'd be black-hat. Otherwise it's white hat.
1. it's not the same people doing these different hacks. The PSN hack just proved how vulnerable Sony was and how abysmal their security practices were, making it a prime target.
2. White hat isn't determined by contracts, that'd be http://en.wikipedia.org/wiki/BlueHat. White hat is anyone who hacks, then informs the hacked so they can fix it. If they don't fix it they go to the Media or publish the method of the hack.
The PSN hackers were definitely black hats, Sony has also been hacked one other time by white hatters, and this time I'd say it's http://en.wikipedia.org/wiki/Grey_hat as they publish a portion of the hacked information to draw attention to the security vulnerability.