If it's like their usual pattern, they rattle their sabers every so often to get some sort of concession (food aid, etc) while the rest of the world -- including their Chinese benefactors -- rolls their eyes.
Some people scoff at them for having basically a 1950s era military that wouldn't stand a chance against modern opponents. That is true, but still kind of a stupid analysis. 1950s-era artillery could still prove very deadly for the South. AFAIK, all of Seoul is in artillery range of the North.