Hello Utror here!
I was thinking, since I found a thread in the Exploits forum, where a guy showed how to lock up the new area changes in cataclysm, by deleting the file named "Base-enGB". So I went there and tried on my friends computer (he did allow it ^^,) then I looked at the files at my computer, and found alot named "OldWorld-enGB.MPQ" and "OldWorld-enGB.MPQ.lock" and many like that. So I thought, wouldn't something change if you deleted/moved them, since at the moment I am patching it up but tell me what you think and or if you have tried or tries it tell me what happends please.
//Utror