Alan Wake, namely that the game was originally planned as a multiplatform release, PC and PS3 included. As reported by CVG, Maki noted that Remedy had to maintain a narrow "focus" to get the project done, which meant staying light on features -- no multiplayer, etc. -- and eventually agreeing to become a Microsoft exclusive.
Regarding the planned multiplatform release, Maki stated that Microsoft's offer to publish the game pulled "one big technological effort, the PS3, out of the equation," thus allowing Remedy to focus on a single platform. That said, Maki added that moving to a single platform "changed the technology risk to a business risk - but that's a subject for a different talk altogether." Ouch.
Meanwhile, the PC version of Alan Wake, for reasons we may never fully comprehend, remains (appropriately) shrouded in darkness.