1. Cats & Dogs need to have water AND food, instead of just drinking from puddles
2. Vampires + Spellcasters get unnerfed (vampires are returned to their original protentional and spellcasters can use magic in all worlds)
3. Mermaids get a power system similar to spellcasters and vampires + a mermaid lore skill
4. Traits have more of an impact on Sims personalities and their relationships
5. New base game world (with at least 13 lots)
Honorable mentions: more CAS traits, more pale skin tone options, hair (and eye) color sliders.