First, it would last a good 4-5 minutes. TO make up for the lack of bloody information!
My idea starts with Chief waking up and spinning and jetpacking and defying the laws of physics by shoving a 70mm wide grenade into the 10mm barrel of the Magnum like the announcement trailer.
The screen then fades out to black, and you hear an A.I. saying ‘Unauthorized sentient craft has entered weapon range.0’
Suddenly, a few red backup lights flicker on, and you see Chief in a long corridor. He is floating down, using the slightly damaged walls to control his passage.
Chief: We still have power?
Cortana: The Dawn’s powered with nuclear energy, it should still power the ship for years. Decades even.
Suddenly, the ship jerks, and an explosion rips through the end of the corridor.
Cortana: Chief, you might want to hold on to something! We’re landing!
Chief: On what…?
Cortana: Some kind of planet. hang on!
Chief grabs onto the floor and clings on. Screen fades to black and an explosion is heard.
Screen brightens, and Chief looks up, quickly covering his face as a small spout of fire bursts from a pipe on the wall. He gets up, and notices a light. He begins walking towards it.
Cortana: Chief? Are you alright?
Chief stops walking momentarily.
Chief: I think we landed.
Chief walks to the light and comes to a gaping hole in the wall. he peers through it, and looks out into an expansive jungle.
Cortana: The air quality is nearly similar to Earth. Gravity too.
Chief moves to walk out when a large crash and a low mechanical droning noise fills the air. Chief stays frozen, and a massive forerunner… thing, like the mechs from Falling Skies peers into the wreck via the hole Chief is at. A powerful blue light scans the wreck. And the screen is washed out by the blue light, which then transforms into the words ‘Halo 4’.
Two seconds later, the same AI can be heard speaking as the screen remains black.
" Unidentified intelligence has crash-landed in zone 153-625A. Request search party."
“Wait… this architecture… This design. Could it be…? Alight the domain. They have returned to us. After 100,000 years!”
Another voice, a low, growling voice talks back.
“Awake the Promethean’s…”
The release date then flashes onto the screen, then fades out.
Thus endith my ridiculously long trailer idea! Do you like this idea?

