Diablo 3 is here! Well, the release date and ability to pre-purchase is. While many of you who subscribed to the World of Warcraft annual pass (monthly payments, but locked in for a year) did so for the free mount and beta access to Mists of Pandaria, you may have also done so for the free copy of Diablo 3 that comes with it. Possibly, I don’t want to assume anything.
Now that Diablo 3 has a release date, May 15th, Blizzard has announced that the promotion is coming to a close. If you want that free Diablo 3, you will need to purchase the World of Warcraft annual pass by May 1st, after which your commitment will only net you a free mount and beta access to Mists of Pandaria.
(Source: Battle.net)
MMO Fallout 
I have purchased the yearly subscription, but how do you claim it? As in how will you get the free copy?
Hello, Daniel.
It is automatically activated. If you look at your Battle.net account, it will show up in your list of games.
-Omali