actually i fyou think about it, they could make quite a wide selection of characters for each class.
they could have the basic races [forgive me but my halo is a bit rusty, so if i miss or misspell one or two leave me alone]
-humans would naturally be Spartans and regular humans
-Covenant could be elites, grunts, jackles, buggers, did i miss any?
-brutes could be...well...brutes
-Flood - the little flood buggers, the big exploding flood that ive named "Mikey", the fast guys with the whips...
okay, so i agree, they would have to pull ou ta few "unseen" characters to make this work, but its possible.
of corse, all going witht he color ranking system, making some harder [possibly having different abbilities?]
then, after that,t here would be the weaponry which would devide it up even further, each "Class" if you will [the ranking system] would have different abbilities, kinda like a race in Wow having racials, which might add a diversity of gameplay style i fthey can do it right. thinka bout it, like a human has +2 attack power with sniper rifle or something, but the sniper rifle shoots alot slower event hough its a bit stronger and has more range, giving a strategic feeling to the game.
then the vehicles, once again i admit theyd have to pull out some "unseen" vehicles, things that were "in beta stages in the past, but were finally ready to try them ou t" or something, or just use halo3 vehicles and weapons, who knows, by the time this is out it could be halo4 weapons and vehicles ~.~
i kinda like the idea, but they will really have to work on this to make it run
edit: then again, this sint even being made by bungie...this coudl suck bawlz...