I just interviewed last week as well. A few math questions were thrown in, but nothing too hard...x temp on SAT at 33,000, what is the deviation from ISA? a crosswind conversion question...30 degrees from runway at 45 kts, what is the component. I think every interview is a little different. What people write here seems to be the meat and potatoes, but you really have to be prepared for anything. Mental Math for pilots is a quick and good review for some of these interview questions, plus you should know the majority of the stuff already. Read up on Cathay history, route structures on each continent, Hong Kong info, know the Lat/Long, population, seasons, Chinese percentage, etc. Be yourself, they go out of their way to make you feel comfortable! Be ready to talk about your entire life, career, how you became interested in Cathay, your interests outside of aviation, etc.
good luck!