No current plans for Uncharted DLC
According to this, Naughty Dog has no current plans for downloadable content for Uncharted: Drake's Fortune, but isn't ruling out supporting the new, streamlined Home when it launches in the spring.
"We don't currently have any plans for downloadable content – instead, we included all our bonus content as unlockables right on the game disc," said the game's director, Amy Hennig. "We're excited about future integration with Home, though, and are looking forward to supporting Home with additional content when we're able to."