free rom in the unsc infinity(so people on minecraft etc can build it in depth), different skins for the flood (not all the flood look the same or the left 4 dead style multiplayer like so u can be a normal flood, the big exploding ones,the one with a big arm i don't actually know what there names are) pelican on some maps, bring back playable elites, like invasion on reach you should be able to play as a knight or elite, halo reach armour customisations, bring back hornet and falcon for machinima, a game mode like a pelican war or a vehicles war, bring back firefight, LASO spartan ops, elite ops, promethean ops, promethean vehicles, flood in campaign, dual wield, more weapons (covernant shot gun,smg)basically bring back most weapons from halo 3 and my be reach