I'm also applying to programs in school psychology, and the same thing happened to me for a few schools. One contacted me the next day. They said about 60 people applied. They invited ~30 people to interview, and they told us that they were only going to accept 12 people. Maybe they already have an idea of who's getting in before the interview? I applied to another school and still haven't heard back post-interview, so I'm assuming I was rejected.
Congrats though!