I found the new 60 Minutes update on information warfare to be interesting. I fear that the debate over whether or not "hackers" disabled Brazil's electrical grid will overshadow the real issue presented in the story: advanced persistent threats are here, have been here, and will continue to be here.
Some critics claim APT must be a bogey man invented by agencies arguing over how to gain greater control over the citizenry. Let's accept agencies are arguing over turf. That doesn't mean the threat is not real. If you refuse to accept the threat exists, you're simply ignorant of the facts. That might not be your fault, given policymakers' relative unwillingness to speak out.
If you want to get more facts on this issue, I recommend the Northrop Grumman report I mentioned last month.