SilverWook said:
The Spock Uhura relationship has it's seed in The Man Trap. The scene where Uhura flirts with Spock was cut from syndication prints for decades. (Not to mention Nurse Chapel is the aptly named "not appearing in this movie" either.) In spite of Vulcan's tragic demise, there have to be plenty of colonies elsewhere, just as human have spread out into the galaxy. And Spock may not have undergone Pon Farr yet...
Spock is for Nurse Chapel only! As for Vulcans, Spock explicitly states that he believes the surviving population after the destruction of his homeworld to be around 10,000. I would have figured there would have been a lot of colonies too but apparently not.
As for Pon Farr, apparently that's going to be covered in the follow up comic After Darkness. (No, really!)