Unless the format has completely changed, expect about 15 or so HR type questions where you will be expected to answer with "give an example of a time when".
There will also be a small number of technical questions. Unless you are type-rated, these will be generic questions on aerodynamic theory or systems knowledge, with the level of difficulty determined by the flying experience of the candidate. These are generally not the questions where candidates fail.
Expect two interviewers, one from Flight Ops, one a current line pilot.