Business Case Study:
Give you a business scenario and you discuss your responses with the interviewer. Afterwards, the interviewer will alter the constraints of the problem and probe how you'd respond. More of a test of your wider skills and knowledge. I found this much easier than the technical interview.
Technical Interview:
Fairly challenging. Mix of straightforward technology questions mixed in with some fairly esoteric tech topics. Unless you studied compsci or have a strong foundation in technology you'll struggle here.