From CNN.com:
"I think we underestimated North Korea's cybercapabilities," said Victor Cha, director of Asian studies at Georgetown University. "They certainly didn't evidence this sort of capability in the previous attacks."
He called the Sony hack, and the studio's decision to pull "The Interview," "a big win" for Pyongyang.
"They got the U.S. government to admit that North Korea was the source of this, and there's no (public) action plan ... in response to it," Cha said. "I think, from their perspective in Pyongyang, they're probably popping the champagne corks."