I do not believe that the subpeonas she is likely to refuse to comply with today, that she litigated to the SCOTUS and lost, has anything to do with this story. while it does mean that the same precedent can be used to get her to talk about this (is there a grand jury on this one?), I don't believe this is the issue they are in court about today. Its about Plame today.
Well, they have said that it does not relate to the Plame case, that they interested in other conversations on other subjects. My guess is that they want to know what else this leaker revealed and that the CIA leaker is now the target of the investigation. It was said in other earlier articles that the Special Council had moved on to a tangental investigation that was opened up by the Plame issue.