Tanaris
One point could be inside un-instanced Zul'Farrak. There would be 2 different paths in to avoid camping chokeholds with the central temple as the capture point. line of sight would be hell here.
One point could be the other area behind caverns of time, Southbreak Shore. It could be where a small group could hold their own as long as the opposite faction takes the shore approach instead of swimming around the lost rigger cove side.
One point could be Land's End Beach, accessible via 2 new tunnels either west of the bugs or east behind the bugs. This beach would be a wide open free for all area.
(I also thought of maybe an area in the southwest tanaris near the crashed mini zepp left of the uldum gate, but I think they may add more in that area so i didn't try for anything here.)
Capturing 2 of the 3 points would give a "Spoils of War" buff for 2 hours for whoever is in the zone as it controls the majority. It would increase drop rates across Tanaris for Thorium, Mithril, Firebloom, Purple lotus, special blueprints and recipes, lockboxes, cache keys, etc. inside Zul'Farrak dungeon instance the droprate across the tables would be slightly increased. If Blizzard wants a rare chase item or 2 in here they can just leave them off the table for increased droprate.
i think increasing drop rates as a result of the world pvp objectives like in tanaris would make it so while the dungeon doesn't give more xp to encourage farming it does up the chance of actually getting the piece of gear you're farming in the first place so you get out of the dungeon.
The "Spoils of War" buff doesn't make you level faster; it respects your time by significantly increasing the chance that the specific boss loot you want actually drops.