It seems someone has already uploaded it on the general WoW forums.
http://hosted.reanmachine.com/wowpatch.php
I didn't use that one, but from people on the forums, it's blazing fast.
You can also try this one. (make sure to download the English patch)
http://a.wirebrain.de/wow/
When you run your Blizzard downloader, it should create a folder called "WoW-1.12.x-to-2.0.1-enUS-patch" with four files in it: wow-partial-1.MPQ, wow-partial-2.MPQ, wow-partial-3.MPQ, and wow-final.MPQ. Exit the downloader, download the files from either of the links above. Copy those files over to the folder created when you finish downloading. Run the downloader again and it'll do a quick checksum then start patching.
Enjoy!