I'm near positive that Orochimaru will gain something from what he is trying to show Sasuke, he isn't interested in the war because it isn't his own project this time. I don't think he really cares what happens to Kabuto anymore, keeping him around was probably a failsafe for when he was attacked by Sasuke and sealed by Itachi, Kabuto and Anko served to carry on his life force for just such an occasion.
I think Orochimaru KNOWS that he has many things that people want, and I strongly suspect that he knew he would be revived (He was only surprised that it was Sasuke who acctually preformed the release.)