Mikko Rautalahti of Remedy has confirmed in the official forum that a novel based on Alan Wake, written by Rick Burroughs, is to be released alongside the game.

I believe it's finished, and I would imagine that you can buy it from the Amazon link in the first place of this thread (or any other site that sells books, pretty much). I didn't spot a release date for it from the Amazon page, but I'm pretty sure it'll come out at the same time as the game, or very soon afterwards.
And as you can see from the link, neither Sam nor myself wrote the book; it was done by a gentleman by the name of Rick Burroughs. (It's based on the work we've done on the game, of course; he had full access to the script and, I think, the game itself.)

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