Gamestop is already happy to take your money in exchange for a future copy of Wrath of the Lich King. And looking at the pre-order page text, I'm thinking there just might be some World of Warcraft fans with a sense of humor working on Gamestop's web page:
Official price and release date have NOT been announced by Blizzard. In this case, the price and release date were determined by the GameStop e-commerce staff, (comprised of overpowered warlocks), using a combination of 6 and 20-sided die.
Important: If the price decreases between the time you place your order and the release date, you will receive the lower price. Woot! If the price increases you will be given the option to either pay the higher price or cancel your order. However, if the price increases by more than $1,000, many of us here at the corporate office plan to retire and purchase a small Caribbean island. You are welcome to visit us at any time. Please bring pizza, chocolate and cold beverages.
Note: We vehemently oppose "ninja looting" therefore your credit card will NOT be charged until your order is processed for shipping. Pre-order now. Power to the players.
They're estimating a cost of $39.99 at a release date of 11/3/08. The price seems likely, since that's what The Burning Crusade sold for, but the release date is anyone's guess. And I don't know about you, but I'm waiting for news on a collector's edition before I do any pre-ordering!