I keep checking Amazon to see if the release date for The Burning Crusade is updated. It's different on so many sites as wowinsider points out because the retailers are just guessing.
Recent Developments: wowvault says there was a blue post that Blizzard is looking at November 31st (31 days hath November? ha ha.). But it was this post (an obvious error) that made me peak at Amazon one more time to check out the release date.
Ooooh, it's updated. But not in a good way. Amazon was kind of an outlier by saying October. Now it says November. Again, I think this is just an updated guess based on the information you see in the posts above.