Not to mention if you release such early details to the press you will create alot of hype, especially with the promises made, and not followed through with. (PC version)
This happened with FarCry 2 IMO, and the likes of Daikatana.

I also think in typical Microsoft fashion, they want Alan Wake to be a 360 exclusive. However I'm a sucker for survival horror, and will probably end up picking this up when it eventuallllly comes out.