A collection of ne'er–do–wellers that go by the name of Lizard Squad inflicted significant denial of service attacks to large online gaming networks over the weekend. These attacks brought to a halt World of Warcraft and the entire Battle.net system, PSN, League of Legends, and Path of Exile. Service to all networks has so far been restored.
The group also took things to a new level by issuing a bomb threat to Sony Online Entertainment's President John Smedley flight to San Diego. This, of course, triggers an FBI response and brings things to a whole new level of national security -- Sony is now not commenting any more due to the high level of the crime. Several people have said that claiming "national security" is an overreaction, however if this group really did manage to get an explosive device on to the executive's plane, then it means there are major holes in airport security.
It's likely that this group of script kiddies just didn't realize how incredibly dumb it is to make such a threat, and will soon find themselves facing terrorism charges, with the DDoS charges just an after thought.
One thing to keep in mind; your data in Blizzard's servers was never in any jeopardy. A DDoS attack is like turning on a thousand faucets in your bathtub all at once and watching the tub's drain not be able to handle the extra water flow. The tub is fine (as is your data), it's just completely useless until the faucets get turned off.