Master Chief statue inside the burning ship at the end of the trailer with the pistol (I think, i'm not sure because it blaster a door open?) he had with fire all around him. And for ingame:
Flood Species for MM. (Infection and some gametypes)
Forerunner Elite Armor. (Makes Arbiter armor look sad)
Scorching Armor. (Heat rises off armor and little embers/fire can be seen coming off armor)
I think this should be added.