We are about a year away from 343’s big release, Halo 4. Sadly, not a lot of multiplayer info has been given out (or any info for that matter). But they must have some big ideas for it, and I’m here to suggest one and see your feedback on it. No doubt, Invasion was one of the most exciting game modes in Reach, being able to tell almost a story and make they player feel like their in a mission from the campaign. So why not expand on such a great idea? Here are my ideas:
Intro: Give a short cut scene of the 6 players on each team sitting in a pelican (or phantom for elites) getting orders for the objectives, then blur out to the player already in the game, not looking through the loadout camera.
Phases: Allow maps/ game modes to have 2-5 phases per game, not just 3 so invasion games can vary in length and depth.
Objectives: In Reach there is three, assault, territories, and CTF. Why not add more variety? I have thought of three more options. Hunt- kill X amount of enemies, VIP- kill the enemy VIP (randomly chosen, has overshields, extra damage, and extra speed), and Generator- use weapons, vehicles, and equipment to destroy one or all the generators (like in generator defense).
Loadouts: Allow players to customize the player stats (player speed, health, and damage) for each loadout along with weapons. So say there’s two classes, one with an assault rifle, one with a sniper. Obviously the sniper is a better class so to balance it down whoever chooses the sniper class will have 50% shields and do 75% damage, but the assault rifle class will still have normal shields and damage.
Phase options: Allow you to change the player options for each team, for each phase. So you can give the elites extra damage in phase 2, or make all spartans invisible in phase 3.
Turrets: Why make a stationary version of the plasma mortor on the wraith or the gauss cannon on the warthog? It would give the defensive team a lot more options. Oh and while I’m on vehicles, bring back the elephant 
Invasion Infection: a new sub game mode where when the defenders kill someone and they join the defenders team, so it’s like infection but the humans have goals to accomplish, like capture cores and territories.
So that’s all I got, what do you guys think?