So odds are that you might be able to grab the game early from stores that are breaking the street date, but it does appear that Blizzard hasn't actually flipped the switch on the expansion, and likely won't do it until tomorrow evening. We'll keep an eye out for more places Wrath may have already popped up.
Update: Thanks to one of our readers for sending along the pic of his Wrath box and the receipt above. The game is indeed shipped and being sold, though Blizzard is saying Northrend won't be available until Wednesday evening. Another reader picture of a purchased game after the break.
Are you ready for the challenges that await you in Northrend? WoW Insider has you covered with our 8-day guide to Preparing for Wrath. Also, check out our feature on AddOns new, old and outdated and Essential AddOns for Wrath written especially with the expansion in mind.