If you didn't pre-order:

The game is maybe sold out.
Wait 2 weeks for the game to be back.
Wait in line.
Get home.
Start Comp.
Then start intallation.

If you pre-ordered.

Wait until 13th.
Go aaaaaall the way to your mailbox.
(don't need to start comp because you already played)
Install game.

EASY!
Too bad it won't be sold out. Nice scare tactic, though.
I pre-ordered cause the local sho lies 5 miles away, and I would rather just go to my mailbox than going on my bicycle to a labyrinth of a mall
I pre-ordered, but still picking it up at the shop at the midnight sale.
my local game stop said that the first week or two they will only have preorder's in the store. Not sure if that's all the stores or just smaller one's...
My ass will be waiting inline at wallmart for it.
My local store said that they would recieve 1.4 copies for each preorder they had. So, if they had 10 preorders they will get 14 copies.
I went to an EB games store near me, and they told me the collectors edition sold out storewide the day they announced it. I wanted it, but if there was that much demand for it, I just settled for the regular version, plus its $30 extra, no thx :/
Fortunately, i don't need to preorder, in my town there are like 5 ppl playing WoW on retail (yeah it's true) so i'll just go buy wotlk in store after i'll leave school. No problem at all, there were only 7 copies of BC sold in my place of live.