Even with them saying it's Halloween themed, that could mean anything. You could say that any dark color fits the Halloween theme, bright yellows and oranges, black, white, and oh god the crackles...they will so be in there. I highly doubt they will put the cool dark glitters or fun finish polishes in there (Beatrix, Max, Estelle, Patti). And pretty much none of the beauty products fit a Halloween theme, so it will be whatever they are trying to get rid of.
I want to say I got a Halloween one last year, or some kind of Halloween kit and it had those cabochon rings and Halloween nail stickers. That's the kind of stuff they give like a $10 value to, even though most of us think of them as "extras."