Putting aside the fancy live-action stuff for a day, Microsoft tonight released this “gameplay” launch trailer for Halo 4.
https://kotaku.com/heres-halo-4s-launch-trailer-produced-by-david-fincher-5953108
As pretty as it looks, “In-game cinematics interspersed with brief staged moments of gameplay from a third-person perspective” might have been a more accurate title.
Though, admittedly, a little less snappy.