Don't hold your breath. Given the past track record of Blizzard, expect this expansion sometime in 2010.

I have StarCraft CD cases with "Diablo 2: coming in 1997" and "Diablo 2: coming in 1998", when it was actually released in the middle of 2000.

Even Burning Crusade was a year late. And I can only cry when I think about StarCraft 2.