I was chilling with a goblin hunter whilst on my nelf hunter, and we had a chat, and came to the conclusion that it would be awesome if there could be some kind of large-scale world pvp war.
I thought of 2 possible locations, Silverpine and Hinterlands.
Silverpine: Allaince start off at Greymane wall and push upwards, Horde start off at the gate to Tirisiful. Both teams try to get to the otherside, maybe kill a boss, if a GM would be so kind to temporarily spawn in. Something sort of like a dumbed down Alterac Valley.
Hinterlands: Same concept of Silverpine, Alliance start off at Aerie Peak, Horde start off at that troll village by the east coast.
And, another idea I had just as I was typing this out.....
Gilneas City: Full out battle, Alliance vs Horde. The entire city as a battle field. I was thinking this could be a day long event.