On the one hand, the publicity for the first movie did the same thing, and Uhura was arguably a more important character than McCoy there, so this is nothing new. It makes sense; not only would it be natural for a modern production to play up its female lead more rather than sidelining her, but Zoe Saldana is one of the biggest stars in the cast and they'd be fools to relegate her to opening hailing frequencies.
On the other hand, remember all those publicity photos for the second TOS pilot that featured Shatner, Nimoy, and Andrea Dromm, giving the impression that Dromm was one of the lead cast members? In the actual pilot, her entire speaking part consisted of four syllables. So you can't trust promotional materials to be accurate.