There's been a lot of speculation as to why an album as hyped up as Jay-Z and Kanye West's Watch The Throne didn't leak. Most people attribute it to the secretive creation process and its digital-only distribution.
One hacker, who seems to have taken control of producer Mike Dean's Twitter account, says that hackers have had the album for a month now, but chose not to leak. The unidentified hacker went on a long Twitter rant and to prove he's serious, he just leaked Wiz Khalifa's "No Sleep" video.