I just saw this post on the World of Warcraft forums(not mine). Figure I'd chuck the ideas in here in case you don't visit them. Only one I don't like is #6. I'd say keep that mount in there some how and just create new meta achievements for fighting in the cities.
http://us.battle.net/wow/en/forum/topic/19072677351
"Honestly, I feel like this is one of the Hallmarks of the Warcraft Franchise. Horde vs Alliance, the big raids on the other faction's city, in an attempt to kill their king.
I really liked this. It's my favorite thing to do in the game. On my paladin, I often join city raid groups for fun, even though I've gotten the achievements a long time ago.
There's something that's so much fun in it, and I know most people hate it, but I think it could be relevant again with a few steps.
1.) Award Conquest Points for killing enemy kings - maybe 100 or 200 per, goes towards your cap (does not exceed cap)
2.) Award Conquest Points for defending your kings - same as above, maybe 100 - 200 per
3.) Increase honor for killing someone in your main city - As a defender of SW/Org/IF/Darn/UC (you get the point) you will get 3x the honor for killing an enemy in your main city, like an honorable defender buff
4.) Increase honor for killing someone in the opposite faction's city - Same as above, if you kill someone while raiding a city, you'll get 3x the honor
5.) For the Horde/Alliance as a weekly quest - You can either do Ashran every week, the four events and tremblade, or you can kill every one of the opposing faction's leaders for your Champion's Strongbox and 500 conquest points
6.) Update Mount - For The Horde really needs an updated mount. Make the Black War Bear unobtainable, and the old one a feat of strength. Update the meta achievement to a new, faction specific flying mount.
7.) Restrict Flying for the Opposing Faction - No flying should be allowed for the opposing faction. When you are in enemy territory, you should not be able to fly. This will add some challenge to it, actually having to tromp through the city and fight your way to the king, or find a way to sneak in. Flying mounts allow you to just run in the keep from the get-go, and I think that really takes away a lot of the fun.
8.) Strongboxes for killing the kings - One for each king, for every time you kill them (no limit). Awards a little gold, maybe some honor, maybe a piece of gear if you're lucky.
What do you guys think? Would you like to see this implemented? Or am I really the only one that enjoys this type of world content?"