| I don't see Hero classes coming anytime soon mainly because the wow community is fickle. All players like being able to change talent specs all the time. Fuck, they even complain about having to pay to radically alter their character. Adding a permanent choice here would be a nightmare. So many posts about "IF I knew the assassin was going to be BETTER than the Blademaster I wouldn't have chosen Blademaster" would fill the forums. Even more cries to nerf, or buff classes than there already are. Current talent trees allow a degree of flexibility and versatility to a class. Forcing a druid to be moonkin forever would probably cause an account to be cancelled.
Granted, I wish that classed could have a more individual progression. Separate yourself by something other than a talent build that anyone can copy if they feel like it, but that's not appealing to the masses. There are so few permanent choices in World of Warcraft. There is nearly nothing that you are required to accept.
Chose the wrong Bronze Dragonflight ring? Well just wait till exalted and you can switch it. Chose the wrong argent dawn commission (spell power vs. attack power against undead, I forgot the item name) destroy it and ask the NPC for a new one. Hated by a faction? Just grind mobs and it's fixed. Most quest rewards offer a permanent choice, but it doesn't have any gravity as you'll replace most quest rewards with loot drops in raid dungeons.
Now Siege weapons. It's not something that can be tacked on and done well. Anywhere a siege weapon can be used has to be well thought out. Plus how do you implement such a weapon? Make it a trinket? Make it a vehicle? You'd have to make it equal on both sides and not make it overpowered. Class balance is a bitch, and now you have to toss in balance with extra weapons? People already complain about getting steam rolled by people in epics. Siege weapons can't have a large jump in power vs. a regular player. To keep BGs fun you'd probably have to implement a siege minigame similar to the Battle tonks at darkmoon faire. But then you're just playing a war minigame and your class is irrelevant.
Mabye I need to fire up DAoC in order to understand how they accomplish siege warfare. | 