Even DHS who never misses an opportunity to hype up something, said yesterday that there was no credible evidence of an attack being planned.
I wouldn't be surprised if it was some independent hackers getting their jollies off, Sony has been hacked on and off for like the past couple years, all of a sudden it's North Korea?
Probably the case. If it were NK they wouldn't be denying any involvement in the hack, IMO
I'm not saying I agree with their decision but it's understandable that they would shy away from it.