they got rid of blizzard north because they were developing the next diablo game and when it came time to put the final touches on it. the head guys at blizzard were not happy and decided to scrap the whole game because it didnt meet their standards. thats why blizzard north is no more because they fucked up and the main blizzard team is gonna re-work diablo 3 at some point just not now cause they are already working on a bunch of projects. blizzard does this kind of stuff alot. the same thing happened with starcraft ghost.