I think it may be possible that Blizzard will hold back Diablo 3 or already are, without telling us the real reason why.

Let's see....There is tons of new games coming out that people are very excited for. They will all be in the competition for Game of the Year.

I think Blizzard may want to win this title and by doing so, release the game next year because of Skyrim and numerous releases this year.

Blizzard won't release Diablo 3 this year, it will be sometime in January.

Blizzard already knows the fan base are very angry because of the Auction House.