My hopes for CAS:
-Categories and EA content for facial piercings, eyelashes, and nailcolor. (There is lots of CC for these and they end up scattered throughout the accessories that have to be reapplied every time, but I'd think I'd rather see EA give it a try. )
-Option to lock accessories or makeup for outfit categories.
-And yes, like @jellywuzhere said, more relationship options.
I know they're never going to add it back in, but the biggest thing I miss about TS3CAS was the skintone slider :/