Since the depo was yesterday, it would be all over the news if he did actually leak it, and that's what was testified to yesterday.
Libby signed off long ago releasing the reporters from confidentiality. This article makes it sound like he recently agreed to do it, but when Russert was called we learned these reporters were called at Libby's request and he had already authorized them to talk.
Notice they did not want to exonerate him and had to be threatened with contempt.
We do know via NBC that Russert told the grand jury that when he spoke with Libby Valerie Plame did not come up in the conversation.
I am positive Mandy Grunewald's husband, Matt Cooper, said the same.