IGN and Gamespot have both put up new previews of the demo Remedy showed them of Alan Wake. Although there aren't many new details, both articles are an interesting read. The game sounds genuinely freaky at some points. One new detail confirmed is that the game world is 10 x 10 Kilometres (6.2 x 6.2 miles). Previous reports suggested a map larger than this, however both IGN and Gamespot are quoting this figure.

Link: IGN and Gamespot