If you haven't rolled your World of Warcraft account with a Battle.net account yet, today's the day to do so. You're required to do it to keep playing the game.
A Battle.net account is a "key ring" that stores all the account information for your various Blizzard games. It also adds new communication features like cross-game chat and allows you to opt into betas for upcoming Blizzard titles. Currently only World of Warcraft uses the new Battle.net but future titles like Diablo III, StarCraft II, and Blizzard's unannounced MMO will do so as well.
Merging your WoW and Battle.net accounts will also net a free in-game penguin pet. "If you create a new Battle.net account after November 11 and merge an existing World of Warcraft account with it, you will still be able to receive the pet. However, please note that we plan to remove the ability to get the penguin pet at some point in the future," warns Blizzard.
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