Andy,
I obtained the launch notification and posted it last week. Here are the details we know so far:
http://www.northkoreatech.org/2012/03/20/itu-confirms-dprk-satellite-launch-... http://www.northkoreatech.org/2012/03/21/exclusive-north-koreas-expected-roc...
Today the state news agency added a little more information:
http://www.northkoreatech.org/2012/03/28/more-on-north-koreas-satellite-miss...
But that might be all we get.
In 2009 a "satellite launch" never produced a satellite and there is considerable skepticism from the international community that this is anything more than a long-range missile test.
In 2009 the North Koreans stated "It is sending to the earth the melodies of the immortal revolutionary paeans "Song of General Kim Il Sung" and "Song of General Kim Jong Il" and measured information at 470 MHz" and didn't get any more technical than that. Like the satellite, the songs were never detected.
I don't have any idea on weather satellite formats, but it could be an all-North Korean one. Russia has not traditionally helped the country with its technical development in recent years. If help came from anywhere it is likely to have come from China.
Hope that helps,
Martyn KJ6SDF