Hi Smoothflight,
I've done the interview in november last year... I see you're from Belgium, if you got any questions you can always PM so we can discuss it in dutch (if you're from flanders) or in french (not that mine is that good, but I can try) or in german (but if your living in the german speaking part of Belgium, than that's a big advantage for your group interview :-) )
anyway, to get the FAA CPL question book is a big advantage...
the computer part is the hardest, four hours of hard work wich you can't prepare,
the interview is standard, and the group discussion is really hard if you're not native speaking german, definetely not if you're discussing with 7 östereichischen about some famous östereicher, whom i never heard of :-)