Rant first. I dislike people who dislike the Draenei because they are "Space Goats." Yes, Draenei come from a different world and escaped it's destruction in a space ship. But did you know that this same world is the origins of the Orcs? So it's ok that the Orcs traveled from their home world to Azeroth through the Dark Portal, but it's not ok that the Draenei traveled from that same world to Azeroth in a spaceship? That's kind of hypocritical.
Maybe it's because Orcs are more of a staple in the Warcraft world than the Draenei, having been in the Warcraft games. I have not played the RTS Warcraft games, so I don't know if the Draenei are mentioned there at all. I have read the Warcraft novels though and the Draenei are definitely mentioned in them. These books were published in 2001, six years before the Burning Crusade expansion came out.
While for many people the Draenei may have come out of left field, I'd like to give Blizzard more credit than that even if their brief mention in the Novels was never fleshed out. The simple fact that they remembered the Draenei and used them means either a good memory on Blizzard's part or they were on the table for awhile waiting to be used.
In other news, apparently Blizzard named a gun after BRK. You can read about it on his new blog site (since he has stopped actually playing). If you enjoyed BRK's WoW blog (or you've never read him and you have a sense of humor), I recommend switching gears and reading his personal blog.