Civ IV: Colonization announced
2K's announced Sid Meier's Civilization IV: Colonization, an standalone expansion for the game. You don't need Civ IV to play it at all, which is nice.
You take on the role of one of four European nations in the game, and the goal, as ever, is to explore, build, grow and win.
More on Shacknews. It's out this autumn.