This is a nice little way for Blizzard to thank all of us for spending years in the game. With over 11 million people playing WoW, and Wrath becoming a hit overnight, there's definitely a lot of celebrating to do over at Blizzard HQ.
The little bear that you get looks a like a small version of the BlizzCon Polar Bear Mount those of us lucky enough to attend BlizzCon this year got. It's a perfect traveling companion for you as you adventure around Northrend.Those of us waking up today and tomorrow will log into Azeroth and find in our mailboxes a little Baby Blizzard Bear non-combat pet. This pet will also give you a feat of strength achievement celebrating World of Warcraft's four years online.