- last post: 01.01.0001 12:00 AM PDT
They may change things, it might not be the same at all. There is no rule that states that they have to follow the canon of the novel.
The game will of course feature the battle of reach as the novel did but may change the specifics...missions, objectives, characters, locations, or whatever works better for gameplay and the narrative.
When the prequel trilogy of Star Wars came out it violated and changed canon of the novels that were written before it. In terms of Star Wars canon the movies supercede the novels and I think the same applies to Halo canon(the games superceding the novels and other materials).
So keep in mind that just because "so and so was doing this at that time" or 'it didn't happen in the book" or whatever doesn't necessarily mean it will end up like that for the game.