If they come back, I hope they'd be more like they were in halo 3. I always loved fighting brutes in halo 3, thought the halo 2 brutes were just annoying and stupid (not the kind of stupid you associate with brutes, but stupid AI). H3 had better brutes because of all the cool ways you could fight them, plasma/BRs, a perfectly placed shot from a sniper, shotguns, etc. also loved their pack mentality, like how they would protect their pack leader, the lower ranks would rush first, then the majors, and if all else failed, the chieftain would make a last stand. Also hope they aren't the banished, I hope they are what's left of the same brutes that served truth and the old covenant, like they've spent all these years since H3 in civil wars, but now there's a leader (Cortana) who promises amazing things in return for their service, so they give themselves to her like they did to the prophets. Remember, brutes (for the most part) are followers, not leaders.