While I didn't interview this year, I can tell you I was only pimped at one place (ie, what's in Ringer's Lactate, how many compartments are there in the lower leg, who was Scarpa, etc.). By far, the vast majority of interviews were questions about myself - why surgery, what I like to do in my spare time, any thoughts about a surgical specialty, what I'm looking for in a program and why did I apply to their program. No one asked about grades, USMLE scores, etc. IMHO, the point at interview is to find out whether or not you are someone they can work with for 5+ years - trying to wean out the bastards, as it were (obviously not always a successful technique).
Hope this helps and best of luck. 😀