"Anyone can give up it's the easiest thing in the world to do. But to hold it together when everyone else would understand if you fell apart, that's the true strength."
Nope, the flood will not even be apart of ODST. It will be only grunts,drones,jackals, brutes, and hunters. (That's the order of difficulty I think.) Plus, Fire Fight will not be on MM maps, it will be on already set maps. So it will be in a city already made by Bungie. They will probably sell more Fire Fight maps for DLC.