I know and I'm running out of patience! mad
According to Games Tracker website

Mafia 2 (PC & PS3):
UK / Continental Europe: 27 Aug 2010
United States: 01 Sep 2010

Mafia 2 (360):
UK / Continental Europe: 27 Aug 2010
United States: 24 Aug 2010


And while we're waiting for the game's release here's a developer diary that discuses the story and the characters:

"Pain has no tendency, in its own right, to proliferate. When it is over, it is over, and the natural sequel is joy."
- C. S. Lewis

"Life does not cease to be funny when people die any more than it ceases to be serious when people laugh"
- George Bernard Shaw