He is directing his campaign against McCain now. He has been paying less and less attention to Hillary for some time now (weeks) and more and more gearing towards the general election.
Frankly, he had this sewn up well over a month ago (before Pennsylvania). The avalanche of superdelegates has already started. I think Hillary will hang around until the last primaries to “keep her word” to her supporters, but she’s irrelevent now, and almost certainly she knows that as well.