I am not a follower of the novels but I am sure they are filled with epic battles, so here is my thought.
What if we could play Firefight mission that were based on Halo fact, I think it would be a great way to fill gaps or pull players further in to the game’s history. Players could play a FF mission from Onyx, at the start get a brief introduction and mission plans. After that you do what you do and get some highlight of what happen later.
I think it would be pretty cool