The interview process is fairly standard. After the initial phone screening, you are required to do a written exercise which tests your analytical skills. If you pass that, you will be required to meet with several directors and analysts for a 1:1 interview.
The questions range from analytical questions that pertain to real business problems, to questions about the business itself. Do your research... go online and check out the website. The worst thing you could probably say is, I haven't really looked at the website.
Other than that, it's a fairly straightforward interview. They don't try to trick you... they genuinely want you to do well. So relax and be professional, but definitely let your personality come through!