I think that its hard to say what each class will be known for other than the obvious. Titans will have heavy armor and be a soldier unit. Warlocks barely have armor, but they compensate for powerful Space Magic. Hunters a bit on the unknown side. Something in between, but still distinguishably different. Some people say "stealth" but i say "outlaw." Think more Han Solo or that dude from Firefly.... but with a sniper rifle. Bungie made it clear that they didnt want people getting hours or days into one class and regret it, so there are probably going to be WAY more similarities between classes than differences. The differences will probably just affect the way you handle certain situations instead of how you play the game entirely. (At least that is what I think) Guardians of Legend