You can now go and fetch the new hak files from here:
http://nwvault.ign.com/View.php?view=Gameworld.Detail&id=6243&id=866The update that requires them will be loaded shortly, so go ahead and download the new files straight away.
If you need any help, try the chat or post on the forums.
We hope you will enjoy all the exciting new content.
Sincerely,
~The Development Team