Saw this in Reddit and I guess it’s a university hint
https://www.reddit.com/r/thesims/comments/9y9ror/my_celebrity_sim_received_this_letter_in_the_mail/?st=JONP2DLJ&sh=1510cddc
Forum Discussion
OMG yes, it has to be Uni! It makes sense that they're making a university expansion pack now, but I don't expect it will be released until around spring 2019. If you look at the theme of the latest packs we've had work, pets, weather and fame. Time for some education!
