I was thinking of a new heavy exotic weapon for class exclusives. For Titans, they can use a power glove that makes them hit so hard, it'd be like the Hulk himself was fighting (Doesn't have to happen but add a projectile attack like a shockwave punch). For Warlocks, they can use a staff that can cycle between elemental damage based on subclass being used (Void slows down the target, Arc stuns the target, and Solar causes burn damage). For Hunters, have a dual wielding weapon like hand cannons (Not sure since swords are already in the game).
Also, for vehicles...add hoverboads, hoverskates, and gliders. My idea was Hunters can use skates, Titans can use boards, and Warlocks can use gliders.