How about the ability to command marines and/or Spartans that have a lower rank then. I will be for campaign, firefight, Spartan ops, you that kind of stuff. I think this because they want to give the control to the players, what better way then to let them command computers?
I could imagine that just like in Star Wars Republic Commando. But in Firefight or in Spartn Ops, I don’t know, because if you play with other players and not with your firends then, they probably won’t obey your command.
If you played Halo Reach and complete the campaign, there is a part were you get a fire team of marines that will follow you. They can use that, so who ever is in your fire team you can command! 