There was a live press conference on Dutch TV a few hours ago (“this broadcast is being interrupted…”) stating pretty much what’s written in this article:
An audit revealed that the government certificates may have been compromised and thus these have all been revoked. The government will take control over DigiNotar and will quickly replace all existing certificates.
It has now gotten to the point where Digid, the Dutch e-government single sign on has is basically saying "We're not secure" http://www.digid.nl/nieuws/artikel/artikel/89/.
Very honest stance, and certificates are to be replaced.
For the backstory, this conference was at 00:30, and interrupting the public channels only happens when there's big news, plane crashes, etc.
An audit revealed that the government certificates may have been compromised and thus these have all been revoked. The government will take control over DigiNotar and will quickly replace all existing certificates.