The biggest addition for SimCity is the introduction of curvy roads. The series has been out since 1989 and it’s taken this long for the inclusion of curvy roads. Go figure.
SimCity Creator will also have Hero Buildings such as the Roman Colosseum and Vegas Tower. Put down a Colosseum in a neighborhood and every building near it will start to transform and adopt a Roman style design.
Destructoid – EA Showcase 08: SimCity Creator impressions