So, what can we expect?
The original Sims game offered a mix of 3D and 2D graphics. While the Sims themselves were 3D, the objects and the world they lived in were 2d sprites. Your Sims, without outside intervention, was either a child or an adult, no in between and no aging.
Skin tones and body sizes were tied to the hairstyle and clothes and initially, the Sims lived in isolation unless friends came to visit, although later packs introduced community lots in sub hoods.