Good news, everyone! If you open up your World of Warcraft launcher, you might notice a line at the bottom that says, "Data for the next patch is available." Yes, it looks like patch 4.0.1 will be coming really soon.
It seems like we're getting closer and closer to a release date. It looks like the first stage patch is about 1.58 GB. If you're getting ready for bed, it might not be a bad idea to open the launcher, start the game and close it in order to trigger the background download.