Board Thread:Theories and Speculation/@comment-7606564-20150502061002/@comment-25712820-20150510045147

True, Orochimaru will always be a villian. So it is possible that the person, who was in the Akatsuki cloak, was Orochimaru himself; he is technically the only living Akatsuki member left.

Or, if we recall back in how Obito said Itachi had a lover, that person in the cloak could be that mysterious lover.