A survey of North Korea coverage:
A military blog called Information Dissemination, which describes itself as "the intersection of maritime strategy and strategic communication" thinks it's possible. In the post "One Sep from War," it says,
"the last straws have been broken. The US has always been on South Korean time, and it appears the clock is set only a minute until midnight."
Nightwatch for last night agrees that,
"Tension is high and small incidents can lead to large reactions."
They were more sanguine last week, writing,
"A review of diplomacy, international relations and leadership activities confirms that North Korea is not preparing for war. Its volleyball team just advanced to the quarter finals at the Asian Games in Beijing. Senior officials are receiving foreign diplomats as usual. Kim Chong il and his son were reported on 23 November visiting a plant together and Kim visited two others without his son.
The number and detail of the activities show that the North does not expect the shelling incident to escalate. There also are no reports of increased civilian or military alerts in North Korea, which would be mandatory precautions if the North expected or intended an escalation."
And 38 North weighs in about North Korea's motives.
Meanwhile for the traveling public, Wikipedia cites these 2009 statistics:
Aircraft movements: 211,404
Passengers: 30,000,000
Tonnes of cargo: 4,500,000
That's the traffic tip-toeing (whistling past the graveyard, choose your own metaphor) through Incheon International Airport, scarcely 50 kilometers from the Koreas' border.
(Incidentally, since I've just come across it, here's another travelogue from North Korea, from Der Spiegel.