Received an email from Blizzard Entertainment and sure others will have who purchased the game.
Thanks a lot for being an early supporter of StarCraft II. The community is off to a great start, with over four million players worldwide and I'm pleased to report that the rumors of the death of real-time-strategy gaming have been greatly exaggerated.
As a thank you for your early support, I've flagged your Battle.net account to receive a free, downloadable copy of World of Warcraft. This is the full version of World of Warcraft that we sell in store and includes a 30-day subscription. Just follow the instructions below to activate it, download the game, and start playing. Again, it's totally free. "