An updated Q&A post on the Alan Wake blog suggests that we'll be getting Alan Wake next month. There's no mention of how much it'll cost, but Remedy have released the system requirements. They mention that they're "still finalising the optimisations and graphics scalability," so they could change a little before release.
The Q&A also mentions that Alan Wake will work with Nvision 3D, though you'll need a top end PC to harness the power of that extra dimension. There won't be a demo, either, but as previously mentioned, we won't have to mess around with Games for Windows Live either. Hooray for that!
To run at maximum settings, with high level textures and the like, Remedy recommend a quad core CPU and "a top of the line graphics card."