Can you expand on this? What has changed -- TV ownership, access to foreign channels, access to electricity?
It seems that more and more North Koreans know about the outside world through smuggled-in phones, DVDs, balloon drops of information from South Korea.
I think that TV and radio ownership is not so much of a factor as the stations are push button ones that make it difficult (in fact highly illegal) to pick up outside transmissions without permission.
On top of that, regime troops stationed on the borders with China (at Dandong, for example) or even those looking across the border from the DMZ will have seen lit-up apartment blocks rising on the other side of the border.
Generally it is accepted by most North Korea watchers that the information blockade is broken. I don't know how long this has been true but my point about it is that even though most North Koreans know they don't live as wealthily as their southern brethren it doesn't necessarily mean that most North Koreans will revolt against their system.
For one thing, North Koreans are taught that:
a) South Koreans may be rich but they are unhappy; to support this they may present suicide figures.
b) The South Koreans are unhappy because they are essentially citizens of a vassal state of the USA.
The North Korean regime may have even got a shot in the arm when the Soviet Union fell as they can claim to be an independent state. The regime tries to paint the South Korean government as lackeys of the Americans and Japanese. For North Koreans, the Korean War ended (or rather didn't end) yesterday. For North Koreans, World War Two ended the day before yesterday. It's very easy for North Korea to stoke the old animosities between themselves and the South, Japan and the USA.
Most of the foregoing is cribbed from reading B.R Myers and Andrei Lankov, among others. But Joshua Stanton's One Free Korea blog is also a very useful source of information.