@LadyAofPineapple I saw on someone's YouTube channel that EA said that sims with cc will not appear on the Cupid's Corner app. That said, as you pointed out, there are bugs related to filtering out cc sims in the gallery, and yet there are no gallery fixes on the laundry list.
As for filtering out sims with cas from packs you don't own, I haven't seen any information on that. Wouldn't it be crazy if the Cupid's Corner app worked the way the gallery does and intentionally shows you content from packs you don't own, so that basically it becomes an advertisement? Yeah, that would be crazy... but as we know, that doesn't mean it won't happen!
They also said that you can favourite sims in the gallery to be included in your sim's Cupid's Corner app. But there are currently 2 active bug threads related to gallery favourites, and neither of those bugs is on the laundry list.
Bottom line: buying this pack on launch will be a risk. Unfortunately, most players do not follow TS4 news closely, so they will buy the pack on launch and have to deal with the problems that we suspect will occur. I'll be watching the bug reports about this pack with interest.