There are all kinds of great little tidbits in here: originally, Warcraft III was planned with the over-the-shoulder look that WoW now has, and that's one of the reasons they wanted to create a more straightforward RPG game. Tom Chilton showed up on the team about a year before WoW's release, and to his surprise, the game was almost completely unfinished -- the level cap was only 15, the talent system wasn't implemented, the AH or mail systems weren't in, PvP wasn't in at all (of course, even at release it was pretty barebones), and endgame raiding was nonexistent. Most of the things we think of as intrinsic to the World of Warcraft -- even things like the Horde and Alliance not speaking to each other -- were debated and almost not in at all as they moved towards release.
And this is only the first part of a larger series, so we'll look for part two next week. Great read, and very interesting to see that the developer team on this game is as times as split up and unorganized as their forums. Even before we started QQing and arguing about gameplay and how it should be done, they were fighting the same fights right up until release.