So yeah, I'm not sure why you think what PistolsAtDawn said is so hilarious since there's already Xbox 360 emulation working on Xbox One, and in some cases actually improving performance over the original Xbox 360 games. Obviously the big advantage there however is that the Xbox 360 emulator for Xbox One was made by Microsoft themselves, who have a deep understanding of the Xbox 360 architecture and will be able to run it as efficiently as possible on the Xbox One, which is why some of the bigger AAA releases for the console such as Gears of War 3 and Halo Reach run so well on the Xbox One hardware, even though you'd assume that it would struggle to emulate such complex architecture (the Xenon CPU in the 360 is actually based on the design of the PS3's Cell, for example).
The guy who put it together to enable Xbox One backwards compatibility explained that the emulator software is just a Windows app that they got running on the console. Well, technically the Xbox One is already running an Xbox 360 emulator.
