
I'll be the one to post this image, so we don't even have the stupid debate going here too.
This is one of the demo units for LocoCycle, it's a PC running Windows 7. Whoop-dee-doo. An unfinished game built to run on an x86 console running windows is running on just that type of pc. As for it running Windows 7, I doubt many game devs are running Windows 8, it just came out last year and upgrading is expensive and wouldn't provide much benefit for the hours of installing and the money spent on licenses. The game apparently wasn't ready to go on the actual hardware, so they faked it with a more powerful PC, same with a few other games. This happens sometimes (especially for E3), it works especially well for the Xbox. This most likely isn't an Xbox Devkit, it's probably the dev's own computer. They just put it on PC.
And before any of you guys say "Well if they do this all the time, why can't PCs run 360 games?" it's because this was a 360 devkit:

The 360 ran a powerpc processor, which uses code that is incompatible with current PCs (and windows as a whole), so why did Macs run it? They had powerpc processors, but the games most likely ran in a custom MS operating system so they could run DirectX.
Please don't turn this of all things into a complaint against the Xbox One, there are better things to complain about.