I'm not sure, I never really watched 90210 except the first episode which I don't remember at all.
The cast is definitely smaller (at least it feels that way to me), it started out with the one guy and two others have developed, one as a friend and one as the aforementioned boyfriend. Only one girl stands out as a lead, the romantic interest, although she has a friend who seems to be in a secondary role right now.
The parental figures seem to be more prominent also, but like I said, I don't know how "pivotal" they were in 90210.
Yeah, they're not exploring new ground, but since FOX lost a couple of other teen shows, I guess this is just stepping up to bat
