The interview is very conversational. There are no trick questions or questions which are off tangent. All the interviewer wants to do is to know you better as a person (I am sure you have heard that many many times but it is true

)
The questions asked are all the basic questions like:
1. Why MBA?
2. Why now?
3. Why Boston?
4. Tell me more about this and that (mostly stuff from your resume)
so on and so forth. Give the interviewer a good well-rounded view of who you are and present him with a consistent story and I think you should be fine
Check admissions411.com for more interview questions asked to students previously.
If you have any other queries please feel free ask