There's a few things but not a lot.
I noticed Sims actually get autonomously reprimanded by their parents now if they break curfew.
-Sims that drop out of high school can't go to Uni like at ALL.
-You can go to Uni as a teen if you graduate early.
-A lot of careers aren't available when you are a drop out from high school
-Can make things like a cheer leading club with Get Together
Still poking around and seeing what else comes up. :3
Haven't noticed too much in terms of holidays with Seasons and the liek with seasons (Nothing too special like happening on love day for the most part)