Really, given the premise that this is an alternate timeline that diverged from the original, they're limited by the character casting of
the original, which was heavy on the white males by dint of being a 1960s TV show. They'd be freer to add diversity if it had simply been a wholesale reboot, Galactica
-style. Then they could have, say, a black McCoy, a female Sulu, whatever. (Khan Noonien Kaur
Yeah, that's crossed my mind more than once. For the 1960's, the TOS cast was pretty diverse. Nowadays, the lack of women is really
noticeable. And I have to admit that I think Abrams et al could've made better efforts to incorporate non-stereotypical female characters into the film. But that's a discussion for another sub-forum.
Am I right in remembering that there actually were rumors going around, probably in '07 or '08, that Sulu was going to be reimagined as a woman? I'm pretty sure I remember Graham Kennedy over at DITL running a poll on the question, but I can't remember what motivated him...