The College is my next priority, so look for Authority upgrades sooner rather than later! :)
As for more girls showing up at the college... that's unlikely, I'm afraid. The game already has 17 main girls, 30+ side girls and assorted one-shot girls. If I keep adding more I'll be working on CK for the next ten years! Some more existing characters may appear for classes, though. Possibly some of the adults as teachers, too. P.E. Mistress Lily, anyone?
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The biggest thing aside from the Authority update I want from the college is to see a certain shy mouse join the weekend fey classes. I think that would be pretty rad. It's probably the thing I want most, with a close second being more scenes with the kids. I love all the wholesome feelings this game gives me.