In the demo there's only 2 "leaders" they are Cutter and Regret Humans are all the same (Cutter, Forge, Anders) except they have a super unit that's unique, a super power that's unique, and a special trait). Covenant leaders are all the same except for their special unit and the leader themselves Humans Cutter -Super Power - Mac blast (up-gradable to 4x) -Super Unit - ODST (droppable) -Trait - All bases start 1 tech level higher than standard -Unit - Elephant Forge -Super Power - Carpet Bomb (upgradable to a super carpet bomb) -Super Unit - Grizzly Tank (dual main cannons and tougher) -Trait - Supply pads start at upgraded pads (cost 225 instead of 100+225) -Unit - Cyclops, they're exoskeletons that repair units and rip apart buildings Anders -Super Power - Cryo bomb, freezes units, kills most air units, makes buildings weaker (upgradable to super cryo which is larger) -Super Unit - Hawk (Gauss carrying Hornet thing) -Trait - Upgrades are half off (except for Hawk and Super Cryo as mentioned by Camnator) -Unit - Gremlin, they use EMP to disable vehicles they hit (only ground based units) Covenant Regret -Can control him and use a glassing ability -Comes with elite honor guard Arbitor -Can control him and attacks units and is difficult to hit -Comes with suicide grunt squad Brute -Can control a vortex thing that gets more powerful the more it kills -Comes with brute squad armed with brute shots

Just different factions i think. Unless you have all 6 in the demo. Other than that, just more maps, campaign, and multiplayer which has fewer than 1000 people on.

Anders and the arbiter took a nerf, hawks and super cryo cost a lot more. The Arbiter has less health. These are the ones I mainly remember.