Congrats on getting an interview.
I got one last year, so here's what I remember. Most of the questions were fairly intuitive in the how well do you work in teams, do you have time to devote to this job, what else are you involved in for next year sense. They also ask you about the newspaper, what you think, what things can be improved on and what you think are good (like, if you apply for a News editor, they'll ask you about the News page). They will, of course, also be asking about your skills and why you applied to the job and why you feel you will be a good fit.
Good luck!