We've covered the news of That Big Development in Star Trek Beyond, and the arguments on both sides. But here's something a bit different — co-writer Simon Pegg has shared his explanation. Seeing as in the 2009 Trek movie Nero went back in time and created the 'Kelvin' timeline in 2233, causing the movie timeline to diverge from the original Trek universe, it's hard to see how his arrival would have changed the sexual preference of young Hikaru Sulu, born on Earth in 2230. The implication is that since Sulu hadn't been shown as gay in the original Star Trek TV series and movies, this felt like saying he had been closeted, which is where Takei's major problem lay.
Pegg has a different thought, one rooted in the alternate universe theory (paragraph breaks added for clarity):
With the Kelvin timeline, we are not entirely beholden to existing canon, this is an alternate reality and, as such is full of new and alternate possibilities. "BUT WAIT!" I hear you brilliant and beautiful super Trekkies cry, "Canon tells us, Hikaru Sulu was born before the Kelvin incident, so how could his fundamental humanity be altered? Well, the explanation comes down to something very Star Treky; theoretical, quantum physics and the less than simple fact that time is not linear.
Sure, we experience time as a contiguous series of cascading events but perception and reality aren't always the same thing. Spock's incursion from the Prime Universe created a multidimensional reality shift. The rift in space/time created an entirely new reality in all directions, top to bottom, from the Big Bang to the end of everything. As such this reality was, is and always will be subtly different from the Prime Universe. I don't believe for one second that Gene Roddenberry wouldn't have loved the idea of an alternate reality (Mirror, Mirror anyone?).
This means, and this is absolutely key, the Kelvin universe can evolve and change in ways that don't necessarily have to follow the Prime Universe at any point in history, before or after the events of Star Trek '09, it can mutate and subvert, it is a playground for the new and the progressive and I know in my heart, that Gene Roddenberry would be proud of us for keeping his ideals alive. Infinite diversity in infinite combinations, this was his dream, that is our dream, it should be everybody's.
Pegg also expanded on his previous post, which focused on the progressive history of Star Trek and why they wanted an established character to be gay, rather than a new one. He explained, bluntly, that Sulu was chosen because of Takei:
The main thrust for those who aren't keen on our LGBT Sulu, seems to come down to two things. Firstly, why Sulu? It's a good point, I mean it could have been anybody: Kirk is a pansexual fun seeker; who knows why Bones got divorced? Nobody said Spock and Uhura were exclusive; Chekov is just permanently horny and let's face it, there's more to Scotty and Keenser than meets the eye.
The fact is, we chose Sulu because of George, there was something sweet and poetic about it. Introducing a new gay character had its own set of problems, as I mentioned before, the sexuality of that character would have to be addressed immediately and pointedly and the new characters in Star Trek Beyond have enough on their plate, without stopping to give us the intimate details of their personal lives. We were concerned it might seem clumsy, tokenistic or worse, too little too late, raising and exasperated, "finally!" from those who've been waiting for representation for the last 50 years.
So why persist when George Takei wasn't keen? The thinking behind embracing an existing character was that it felt as though it retroactively put right something that had long been wrong. By the time, we mentioned it to GT, the idea had taken shape, it felt good, interesting and worthy of thought and conversation.
We were disappointed that George didn't see it that way but, truth be told, Sulu Prime seemed to be missing a very important point. With galaxies of respect to the great man, this is not his Sulu. John Cho does not play a young George Takei, nor does he play the same character George Takei played in the original series. He is a different Sulu.
Pegg concludes by saying that loving Star Trek means "we all want Gene's idea of a tolerant inclusive, diplomatic and loving Universe to become a reality." This was their contribution to forwarding that world.
Read Pegg's whole post here.