Larian Studios Forums Divinity - Original Sin Divinity - Original Sin - General Confused about the release date.

That's an estimated release date. I think a lot more of the game world is more done than we've seen, it's just sparsely populated. Larian said that the build they've been showing off is deliberately limited, not showing off all the skills and such because they want to be able to show new areas and new skills gradually over time so the press will have something new to get excited about.