I personally don't want a trait system that is tied to a zodiac sign. I much prefer to define my sim with the traits I feel suits them best as the character I have in mind for them to be.
As long as that was an optional thing that players could turn on/off, that would be fine.
Like @DevSims91, I too am hoping for some type of traits point system, I don't believe that traits should be equally divided, that makes the sims way too similar.
In TS4 if you give you sim 3 traits they are equally divided, so if you would have 2 sims with the exact same traits they will act the same, such as
Cheerful = 3 personality points
Lazy = 3 personality points
Adventurous = 3 personality points
With a Point type system, I could create this instead
Sims A
Cheerful = 4 personality points
Lazy = 2 personality point
Adventurous = 3 personality points
Sims B
Cheerful = 5 personality points
Lazy = 3 personality point
Adventurous = 1 personality points