Quote Originally Posted by JohnGabriel View Post
Remember with the new rep system you should get one toon to revered first.
http://us.battle.net/wow/en/forum/topic/6794350230

Seems like best idea is having your teams farm rep with different factions until at least revered, then move everyone over to tillers.
You need to be revered with golden lotus before shadowpan open up and exalted for august celestials

So you can only really do this with tillers, golden lotus, klaxxi, serpent riders IIRC.