That doesn't mean a PC version of the game is never coming out -- after all, the game's release window is still a year away. We've contacted EA to see exactly what "the plan" entails. Perhaps an elaborate casino heist?
Update: An Electronic Arts representative responded to our query, stating "Visceral Studios is dedicated to delivering an outstanding Dead Space sequel for the Xbox 360 and PS3. A PC SKU is under consideration. Nothing additional at this time."