The hand in the blue uniform is clearly in LLAP position.
And I suspect the one in the black sleeve belongs to Pike, getting deep-sixed - the trailer's designed with a lot of misdirection in mind, AFAICS
What if Paramount goofed and spliced in part of an old fire prevention video, where you have to touch your hand to the door to see if it’s warm?
Never thought of that, did ya? Some unreleased video done in the 1960′s: “How to Live Long and Prosper from Fire Prevention with Leonard Nimoy!”