Some publicity pics from Empire magazine and the STID app. TrekMovie theorizes the white thing is a photon torpedo.
Well it does say "Phot" on the side, so I'd say it's a safe bet. It also looks like it says CVN65 on one of the winglets; if so that's a odd little shout out--unless it's a wink and nod to someone that team knows.
If it is a photon, I like it. As much as I liked the chiklet of doom designs, this looks like it could be some form of a missile weapon.