I’m not really enamored of the JJ Abrams take on ST, much of it seems to be a case of “let’s change something just a little, not enough to make a big difference, but just enough to put my Own Stamp On It”.
Star Trek has included interesting twists on traditional heterosexuality before, not just the “Trills who were man and woman in a prior life meeting up as two women” episode of DS9, but I recall on TNG, Riker once has an affair with an alien from a culture in which any romantic relationships are considered “unnatural”.
Also, the Enterprise series (though IMO the franchise jumped the shark with that one already), had one episode feature aliens who actually have 3 sexes, traditional “male” and “female” and a “congenitor” that plays some kind of role in the conception of children, and are treated very shabbily, essentially as slaves who don’t even have any right to parent the children they help conceive. Troy keeps calling the congenitor “she” and though no one corrects him, his attempts to help “her” end tragically and it did seem the message was supposed to be “he shouldn’t have gotten involved in something he didn’t understand, this is why the Prime Directive exists”.
Although even that storyline seemed to me a ripoff of the Alien Nation concept of a 3rd sex, the “binnaum”, whose function is to “catalyze” the conception of an embryo by having what appears to be intercourse with the female, but the “binn” doesn’t actually contribute to the offspring’s genetic makeup, but apparently whatever chemicals wind up in the female’s reproductive system are essential for conception to occur when the actual male later has intercourse with the female. (Not to mention the idea of a quasi-male pregnancy, in which the female transfers the fetus early on in pregnancy to a kangaroo-like pouch in the male’s abdomen.)
Anyway, I think there could have been other more creative ways to address homosexuality in the series than “let’s make Sulu gay because the guy who played him on the original show is gay”. AFAIK there is a scene in the “Eden” episode that makes it fairly obvious Sulu is straight, though I suppose one can retcon this into Sulu being bisexual.