From what i get out of it, it aint sony that has been "hacked". Correct me if i am wrong but it seems they are saying a rather large list of pid's and passwords has been tried to see if they work.
These attempts appear to include a large amount of data obtained from one or more compromised lists from other companies, sites or other sources
so to me thats saying Something like a stats tracking website or the likes has been compromised and the log in details from there tried against the ps network to see which if any work . After the last scandal you would think people would have smartened up and use different passwords for different sites but clearly that is not the case here.