The minute they move southward in a blizkrieg, Pyongyang will receive a cruise missile ass whooping the likes no one has ever seen. Their military elite know this. That does not stop them from being suicidal and crazy; they are a nation-state-cult, you know. I would not be surprised to see early and unconconditional use of tac nukes, maybe even one snaking up the Pottongang River right up an orifice of Kim Jong-il (who by the way is already established as having been a mass murder himself: Rangoon bombing, KAL bombing, kidnaps and rapes, purges)....
I thought the Bush warning to North Korea was kind of cool. Also, our intelligence must show some signs in DPRK or I dont think Bush would have issued such an unveiled threat at this time. Time to watch the Peninsula.