I just logged into the WoW site to add some more time to my account to add some more time to it and a weird page came up something about wotlk (maybe they are messing up when they changed the layout?) anyways I clicked around a bit, then logged to my account and there were some strange items in my mail. Maybe you can get some stuff too, dunno what they do yet
1) Go to this link http://www.worldofwarcraft.com/events/prebonus.html
2) After I logged into my account I could like look at some items and crap so try that.
3) Log into your WoW account on the game and check you mail. If theres nothing there just try it again. My friend had this problem and it worked after he tried again.