Nonsense, this is the marketing dept appealing to women and diversity.
Well, no, it's not nonsense. Yes, featuring the female lead in the publicity doesn't prove anything about the contents of the film itself, as a general rule; but independently of that, the previous film
already established Uhura as a more prominent character than McCoy in the new continuity, and given that Saldana is a bigger star than Urban, there is absolutely no reason to expect that to change this time around.
Ehhh no on many counts. Urban is a bigger star, who has been in bigger movies, and McCoy still plays a bigger part. He's the current best friend of the main focus of JJ's movie...Kirk, and his story of growth to the 5 year mission. Uhura is secondary or even tertiary to this.