According to the New York Times, there are new news services, using anonymous sources in the country and Chinese cell phones, who get information out to the world at large. The news is always sketchy, coming in like an intelligence report from a foreign agent, but some very large scoops (including the revaluation of the currency) came in this way.
An example is the fact that there is apparently a "50-Day Crackdown" trying to "restore order" within the country. That the North Koreans even have to worry about this is something that the Kim regime tries hard to keep the rest of the world from knowing.
It's worth taking a look at.