They know who we are!

Quote Originally Posted by Blizzard
While this will change over the course of the expansion pack as you gain power, the tuning values for a fresh max-level character we're currently shooting for are:

Normal World Quests: 1+ player(s)
Rare World Quests (blue, no dragon): 2-3+ player(s)
Rare Elite World Quests (blue, dragon): 3-5+ player(s)
Epic Elite World Quests (purple, dragon): 5-10+ player(s)

Some content will be easier or harder within each difficulty band, this is intended. We would like the outdoor endgame to have challenge peaks and valleys.

More about World Quests : http://us.battle.net/wow/en/forum/topic/20743204177

Only concern now will be the randomness on the quest popups,
what are the odds having the same quest on 10 toons at the same time ( if these are not shareable quests )