The changes Microsoft has made to challenge Android and iOS in gaming appears to be bearing fruit. With Support for technologies like Unity, Havok, and UDK, developers do not have to develop code twice. They can import their C++ or C code and then work in the SDK to finish adapting the game to the platform.

Also, by introducing a kernel based on Windows 8, more powerful game experiences are now possible. This brings us to the new title in the Halo franchise. Would this have been possible if Microsoft had stuck with an OS based on CE (Compact Edition) rather than the desktop OS?

http://www.pcworld.com/article/2040748/halo-infiltrates-windows-8-mobile-devices-in-july.html