I interviewed at the end of last year and was offered a class date. You will probably interview with one of the two assistant chief pilots. If the interview is still being conducted at the Crowne Plaza, H.R. (probably Hedi) will give you your written, then shortly after, you will start the interview.

Written (Mostly fill in the blank, very few multiple choice)
-IFR (ILS hold short line, what is needed to decend on an approach, alternate 123 rule, approach categories (they won't ask this directly but you need to know the different categories because the question gives you a speed), IAFs)
-Runway width illusion
-Rotating Beacon

Interview
-Why Great Lakes?
-Have you ever failed a check-ride?
-Have you ever broken a FAR?
-Have you ever been scared in an airplane?
-Are you an instructor?
-How are your instrument skills, and if you had to take an instrument check-ride today, could you shoot a NDB approach within PTS?
-Technical
-Critical Engine
-Vyse / Blueline
-Lose an engine, how much performance is lost (80%)
-Calculate a crossing restriction in terms of how many miles out would the decent start
-Jepps and Basics
-DME arc approach, can we join the approach anywhere on the arc?
-Whats this? (In my interview, it was a feeder route from a VOR to an IAF)
-Airport diagram, whats this? (Mine was a hot spot)
-Enhanced taxiway centerline

Good luck on the interview