I'm still surprised a company is willing to reveal how many sales they are getting, usually they're all pretty anal about that. I wonder if Frictional will still keep giving us numbers after the game is released... or better yet, tell us how many copies Penumbra sold :
A fancy little box that shows up when you click on that button on the webpage that says "Extra" tells you that the extra content will be commentary in English on the making of the game.