here are a few ideas first person vehicles optional more weapons costomisable weapons (not like cod more like brink) custom campaign missions...
they have one in custom edition called the mythos which has a large seminuclear laser on its back
as soon as i get back on my xbox ill take some screenshots of the maps
part 2 Bungie.net : Halo Reach : File Details part 3 Bungie.net : Halo Reach : File Details part 4 Bungie.net : Halo Reach : File Details...