My initial thought is that it sounds like a Starfleet officer has attained superpowers and turned against his own people.
Yep. I wonder who that might be?
It sounds like the kind of very simple premise that lends itself to putting butts in seats. You could practically convey the idea via a poster. That's a good thing - ideally, the next movie needs to be an even bigger hit than the last one, and it doesn't pay to confuse the casual audience who has probably already forgotten the 2009 movie. Just give them something simple that promises to be exciting and fun.