…and release it with Halo 4 as a code to download, perhaps?
They could most likely keep all the existing levels as they are, but add on to them and/or add an additional 2 or 3 levels. It seemed like there was so much potential in the campaign. The emotion could be fleshed out a little more, too.
Here is how I see it some of it (they could be turned into extra missions, all playable from the start):
Winter Contingency: Let’s not end it right when you hit the switch. After the last cutscene plays, there should be an escape. The Covenant were pounding the outpost, right?
ONI: There’s not much to add here. There could be a sequence at the beginning, nearing the base, fighting off Covenant vehicles and enemies using the falcon’s guns.
Nightfall: People say that there wasn’t enough stealth in the mission, so let’s let the part before the first cutscene playable. Hiding behind rocks, picking off Covenant from high up, and avoiding Phantoms, otherwise, they will open fire/drop off enemies.
Tip of the Spear: We all know what should be added here. The first cutscene can be turned into a huge, action-packed battle/charge, with you as the driver of a gauss warthog, avoiding banshee and wraith shots. Ghosts and revenants can charge at you too. This could end with having to turn to a damaged bridge because of overwhelming fire.
Long Night of Solace: I guess we could have a struggle/skirmish through a canyon as seen in the first cutscene, running from the scarab. Also, let’s have the space battles last longer. Following the UNSC Savannah, you could have to defend the bomb from banshee fighters/Seraphs.
Exodus: At the very beginning, after dropping from orbit, how far does Noble Six go to get to New Alexandria? How about some brief skirmishes turning into battles, with meeting UNSC soldiers, who die by the time Six reaches N.A., in the forest Six emerges from.
New Alexandria: N/A
The Package: At the beginning, how does Six make it past Covenant defenses of Sword Base? Let’s have a level surronding that, beginning with a falcon ride in.
The Pillar of Autumn: It’s already a large mission, let’s leave it.
Lone Wolf: Should we have Six meet up with remaining allies to fight off Covenant?
These are just my ideas on how the missions could be revised. Please share your thoughts, too. Maybe it could work.