I really like what 343 did for halo 5’s opening level. There was a massive battle going on in the skies with ships in the background. And troops being dropped, and explosions.
For infinite, I wish the same was happening in backgrounds for the multiplayer maps Bazaar, or Fragmentation. I just wanna see chaos going on while the battle goes on. I think i would be awesome. I like the pelican drops and thats cool. So more of that and adding some stuff going on in the backgrounds while be sweet.
Maybe even have a mode where its big team battle, and you have Flood spawning at certain times acting as 3rd party. Flood would be Ai though. While the 2 teams fight it out.