No, my guess is that it is Rudy and that it is not really big news. I think that they are holding back on this, trying to build the hype for severa; reasons, one, because whatever it is will not be any great revelation; two, because holding back the information may cause doubt in the minds of primary voters; three, because Hillary wants to hold on to the information for a more opportune time, when she can use it to her fullest advantage.
Think about it......Oprah has been twisting arms throughout the entertainment world for months to raise money for Obama. She has had him on her show and has refused to have any other presidential candidates on. Their home base is Chicago and they have known each other for a long time. Her endorsement has been arguably Obama's most important. And she is certainly powerful enough in L.A. circles to make the paper sit on this story.