flyhighspeed300 - with regards the interview:
Basic ATPL theory, if you know your stuff and do a bit of revision, you should be ok, they're not trying to trip you up
when I interviewed, they spent a bit of time on my CV, just chatting about my background, experiences, etc - again, just be open and honest so they can see what kind of person you are.
Re the Sim check:
There will be vast differences between the 200 and 800, I did my MCC on the 737-400 and found the 800 to be alot quicker. You will have a full brieifing pack to prepare yourself, up to you if you feel the need to pay for more sim sessions!
You will be given the plates on the day for whichever procedure you will be flying, pretty irrelevant knowing them before hand, you have enough time to prepare! Other than that, there will most probably be some general handling, NDB tracking, etc. Don't do anything you wouldn't normally and remember CRM!! Good luck