Blizzard is now offering the patch downloader for the new WotLK expansion (though not officially announced yet). You can get it here:
US Version:
PC: http://www.worldofwarcraft.com/account/download/clients/pc/InstallWoW.exe
Mac: http://www.worldofwarcraft.com/account/download/clients/mac/InstallWoW.zip
EU Version:
German PC: http://www.wow-europe.com/shared/downloads/protected/InstallWoW_deDE/InstallWoW.exe
German Mac: http://www.wow-europe.com/shared/downloads/protected/InstallWoW_deDE/InstallWoW.zip
English PC: http://www.wow-europe.com/shared/downloads/protected/InstallWoW_enGB/InstallWoW.exe
English Mac: http://www.wow-europe.com/shared/downloads/protected/InstallWoW_enGB/InstallWoW.zip
French PC: http://www.wow-europe.com/shared/downloads/protected/InstallWoW_frFR/InstallWoW.exe
French Mac: http://www.wow-europe.com/shared/downloads/protected/InstallWoW_frFR/InstallWoW.zip
Spanish PC: http://www.wow-europe.com/shared/downloads/protected/InstallWoW_esES/InstallWoW.exe
Spanish Mac: http://www.wow-europe.com/shared/downloads/protected/InstallWoW_esES/InstallWoW.zip
We will be still offering a download of the EU-DVD image for some more days - if you haven’t received a link please contact our support with your order number.