The Xbox One games and apps actually run on Windows 8 according to an article by Wccf Tech
If you run a game or an app on the Xbox One, it will either run in the full Windows 8 or the stripped down version of Windows 8. The Xbox One essentially runs three operating systems, the Host OS, Shared Partition and the Exclusive Partition.
The first tier ‘Host OS’
and the ‘to-the-metal- operating system present in Xbox One dubbed the ‘Host OS’ is an RTOS (Real Time Operating System) has complete control over the entire Xbox One hardware and resources. In Frank Savage’s words “… owns where everything and how everything works…. owns CPU…GPU”. This is your basic Xbox One Operating System. However the thing is, this particular OS only handles tasking and the security layer. It does not run any game or application. It does however host (in a non – hyper-v form) the ‘OS’ and the ‘Exclusive OS’, which is Windows 8 and the stripped down Windows 8.
The second tier ‘Shared Partition’
is occupied by Windows 8. This Operating System is “virtually indistinguishable” from the Windows 8 we know code wise. This particular Windows 8 handles all the basic functions of the Xbox One including the shell. Shared Apps are run here. It handles some major features of games such as networking and some audio.
The third tier ‘Exclusive Partition’
is the Exclusive OS, which in Frank Savage’s words is a “Windows 8 that has gone on a massive massive diet…… lean and mean windows 8″. It has been hand tuned to remove any and all bottlenecks as well as bloatware. However this is the part which defines it as a ‘partition’ and not a virtual machine. All the Direct X draw calls go straight from the Exclusive OS down to the Host OS. It does not go through the full windows 8 ‘ shared partition’.
Basically the Xbox One is a true X86, X86-64 machine. Any game that runs well on the Xbox One would run equally well on Windows 8 (desktop pc). The porting capability this implies is very powerful, in fact port-lag is non existent, simply convince the devs, and you shall have the game on Windows.