Just found this article. http://www.destructoid.com/gears-of-war-2-not-coming-to-pc-101748.phtml
In an IGN interview with Cliff Bleszinski, it was revealed by Cliff that Gears of War 2 would not be coming to the PC. The point of interest came up in a question about Gears 2’s “Linked Achievements” and the Achievement portability with an account from Games for Windows Live. Cliff said that if you use the same gamertag as you had with the original Windows version on your 360, you would get the retroactive content. When prompted about a PC version of Gears 2, Cliff spilled the beans:
Gears of War is a great franchise first and foremost for Xbox 360, and therefore we're focusing on that platform for Gears of War 2. We've decided we're not going to do a PC version this time around.
