So many great ideas in this thread!
I'd really love 4 or 5 columns in CAS.
Infant life stage added. Even if the baby has to appear in a cradle, it would be nice to give the baby new clothes, edit the name, and age them up or age Sims down back to baby.
Separate categories for facial piercings and earrings.
Separate categories for sunglasses and eyeglasses.
I also really hope makeup will be changed to be copied/carried over from everyday to the other outfit categories.
Jewelry like rings to be copied over through all the categories, so I don't have to add the wedding rings manually across all the outfits.
Ability to edit a Sim to change their human/occult status and create ghosts.
Ability to layer multiple types of facial hair.
More hair colour swatches.
All hair styles available to all ages from toddler to elder.