North Korea is just full of bluster BUT just the other week, there was an outage of South Korea's main broadcasters and banks, and that outage was immediately blamed on North Korea; it now transpires that China was probably responsible for it but a knee-jerk reaction to something like that in times of tension could easily result in some real action taking place.
He's a jumped up little twit who is being controlled by his generals. They just want to ensure their cushy lifestyles continue and the "1000s" of supporters are paid to demonstrate or do so because they know better than to say no.
That said, China should put a bit of control on him.
Moving swiftly on... I think (hope!) that this is more about Kim Jong-Un's standing inside North Korea than outside it, making him look a strong, powerful leader fully capable of filling his father's shoes. It had better not lead to anything violent, and if his generals had any sense they would know that it's a hopeless cause to try anything. Not least because China isn't on their side this time.