In answer to the poster's question:
Off the press release announcing the retail date:
"After the initial free one-month subscription ends, players of World of Warcraft will be able to continue playing under one of three different subscription plans. The month-to-month subscription plan costs $14.99 per month, the three-month plan costs $13.99 per month, and the six-month plan costs $12.99 per month. World of Warcraft subscription fees can be paid by major credit card, PayPal, and pre-paid game cards, which will be available in stores where World of Warcraft is sold. World of Warcraft has received a Teen rating from the ESRB."
Can even use PayPal, that's cool.