Thanks to both of the above posters for their congratulations and great advice. Is it weird that there is no presentation involved? Is the presentation standard or does it depend on the university usually? And how many people do libraries usually call to campus for an interview? I am in the top 2 or 3 or 5 - does anyone have experience with this?
A presentation to the library faculty/staff is standard for interviews. I'm surprised, actually, that you don't have to prepare a job talk. That being said, I've also been on one interview at an academic library where I was not required to give a presentation either. But I think it's unusual.
Hard to say how many people a library is likely to invite to campus for interviews. I think 3 candidates is generally the norm, although I've worked at libraries where anywhere from 2-5 candidates were brought to campus.