I would bet money that it's related, yes. The asshattery perpetuated by geohot et al. lead directly to these sorts of things--that's the most likely way I can see for an attack that necessitates downing the service to fix it to be launched. They've compromised what were assumed to be trusted clients, which seems likely to be the vector for an attack this serious. (And to forestall the usual: from a technical perspective, obviously Sony shouldn't have trusted clients at all, but just because a window's open doesn't mean going through it isn't trespassing and taking things while you're there isn't theft.)
You poke the fate bear, the fate bear eats you. Unfortunately in this case, it's also chewing on my leg, too.