What CAS additions would you like to see, or believe they will implement in TS4? I really hope they add piercings at some point (maybe with an University EP?) and nails (maybe in a witch pack, sinc...
Aside from nails which obviously should be a part of Witch pack, the game truly lacks chemistry system with zodiac signs and with Sims 4 they could make chemistry system something much better than it was in previous games, much more meaningful and more complicated.