Serious question....how do these projects get leaked? Common sense always told me that the artists leak it themselves. Is it a case of someone hacking computers to get the music?
Most of the time, new music is sent through email, whether it's directly between artists, label execs, or engineers. It is the hackers who hack into those email accounts and leak the music.
Sometimes, when an album is manufactured and shipped (1-2 weeks before release date) to various stores, a worker can easily steal a copy of the CD and upload it online.
Jay-z and Kanye have been in the game for too long and are being smart which is why they are releasing the album digitally first through itunes 4 days before they release it in stores. That way, fewer people will have their hands on the physical copy of the CD prior to its digital release.
Jay n Kanye n their engineer probably have the album on an usb drive that they are physically holding onto until Sunday night which is when they will upload it to the Apple/Itunes server.