I'm going to have to agree with Disposed here fellas. Anonymous doesn't have a MO, they're a group of random internet fucktards and trolls doing whatever they can, for the LOLs... Hell, they barely deserve to be called a "group" at all.
Now, I strongly doubt that Anonymous was responsible for this, but it may very well have been a member of Anonymous. However, this is a major bit of misdirection from Sony. How about rather than telling us that Anonymous did it, they tell us that they've evidence pointing towards the criminals involved and they've turned their logs over to law enforcement for further investigation? Then if it comes out that the morons involved were part of Anonymous, (if that's even possible) they can say, "Joe Smith, who is loosely aligned with the hacker group Anonymous..."
(Not that I think most members of Anonymous are anything more than script kiddies... or a group, but you know the media.)
*As a side note, my several year personal refusal to buy any Sony products continues. It takes work, Sony owns so many brands I have to do some research before I buy anything. The only one I'm not 100% on for several years has been the occasional movie ticket.
I think Anon and every member of it are pieces of shit, but with the things they have admitting to doing there is something of a MO. Or at least something that can show off their level of skill. If this was an organized attack by Anon members under some kind of official bullshit banner they'd probably take credit and make some lame BS statement about doing it to prove a point.