BlizzCon this year (either via attending the con or through DirecTV), then you're in for some happiness tonight if you redeem it.
The redemption now works. You can go to http://www.worldofwarcraft.com/misc/promotion.html and fill out the forum there to get your prize all setup. Take the code that's given to you and head to Ransin Donner in the Forlorn Cavern in Ironforge – not the guy in STV like the page says. Turn in the code to Ransin and you'll be presented with a Bind on Account Polar Bear Mount!
Yes – Bind on Account! That means you can use the mount on any of your characters on the same account. Very cool for those of us with tons of alts.
Take a look at the gallery below for what the polar bear mount looks like. You'll probably see a few of these pop up over the next few days in your travels around Azeroth.