This is potentially a big deal. North Korea is nuclear, and even with stable leadership was a dangerous regime – a “rogue” state, as it were. He’s reportedly groomed his son to take over (Kim Jong Il took over from his father). If this leadership change creates any instability in the North Korean government, that may or may not be a good thing. Obviously, an Asian Spring would be welcome in principle, but revolutions are trickier when nukes are involved, and when we’re talking about a country that seemed ready to use them for a while now. There’s also no saying someone even more hardline couldn’t take over.