Co-Developer of Marine Arena, 2nd most popular Starcraft 2 map in America.
I was wondering (requesting) about what all you will be fighting in firefight, you are probably thinking something along the lines of, "you're fighting the covenant in firefight you moron!" but hopefully you are atleast patient enough for me to mention the flood. I know the flood are highly unlikly to be in the actual game, but if they would a appear in firefight, then that would be cool. Maybe just a few levels that are completely away from the storyline and have flood assualts rather than covenant forces.
I doubt this would mislead people about the story line ether, because in firefight the mindset seems to be, shoot until you drop. and if you preorder ODST, then you get Sgt. Johnson, now i'm pretty sure he doesn't die until halo 3. So there must be some leniancy toward firefight, and anything having to do with the story, so I don't see why we can't throw flood into the mess as well.