One of the most interesting things we heard from Jeff Kaplan last week (besides that he agrees the Green Hills quest sucks; won't do that one again) was that quest designers are given only 511 characters (not words) to put their quest text in.
It's surprising to think that they've created all the backstory, throughout Azeroth, in just 511 characters at a time. But even Kaplan said the limit is a good thing: it means Blizzard has to show story to the player rather than tell it.
Still, doesn't seem easy to
Crap. Out of room -- that's 511 characters. Of course, they can fudge things a bit by having those "story quests" where characters can use multiple pages to build up their background, and the 511-character limit doesn't apply to all of the dialogue -- some of the later quests have pages and pages of dialogue as the quest goes on. But squeezing enough information to keep a player interested in just 511 characters is quite a feat.