-University
-more depth to elementary & high schooling (such as the ability to get accepted into a private school, having grades affect aspects of sims lives further on)
-More jobs (such as a rockstar music career branch, something like the slacker job from ts2,etc. just more variety to fit different sims) and the ability to have a part time job
-Added detail to babies (mainly giving them more possible skin tones)
-graveyards + funerals/wakes
-more activities/content specifically targeted towards elders (knitting, canes... I can't really think of many more but I definitely think our elders are overlooked in the game)