There were no unexpected questions. Be ready with examples for your achievements, difficulties faced and how you tackled those. Tell me about your recent experience when you handled a difficult situation and how did you manage. My suggestion will be to google it or scan the Deloitte website and search for white papers/articles written by/contributed by the partners and senior managers who are supposed to take your interviews. They will be happy to hear that you have gone through the articles and ask some questions related to those articles.