I would like to see sub-classes in WoW! It would allow you to further personalize your character. Things like - eg. Hunter - Demon Hunter - Shadow Hunter Druid - Of the Claw - Of the Fang Shaman - Far Seer - Spirit Walker Rouge - Warden - Assassin
I also think racial sub-classes should also be available. eg. Dwarven Warrior - Mountain King Human Paladin - Anti-Paladin Gnome Warrior - Tinker Orc Warrior - Blademaster Human Warrior - Knight
World of Warcraft is going to feature Hero classes. Right now, Blizzard is discussing how these will work. The most probable conclusion is that at a certain level (most probably 40-50), players can find a certain NPC (for a Night Elf Hunter it would be a Demon Hunter NPC) that is willing to train him/her. The Hero classes, if made avaliable to players, will most probably be an extension of the normal class, with new skills and spells, maybe stat bonuses as well. The Glow attachment to Heroes is not probable.