No, you're forced to be connected to a server even if you're playing single player. No one can play the game until 12PM PST, period.
Are you serious?
So - if someone wants to play on a computer that's not internet connected, they can't?
Am I misunderstanding you? If I'm not - my respect level for Blizzard just dropped to about 0. That's a [censored] move to pull.