Xbox One is going to be advertised and promoted to hundreds of millions of people this year, every time they turn their PC on

[iTechHeads]

There's already Xbox Games and Xbox Music apps on Windows 8.
Anyway I doubt Xbox needs any promotion with Windows since most people buying or upgrading already know that Xbox One exists. Also I don't think there's any major reason for Windows 10 owners to buy an Xbox. If you're gaming on a Windows PC, chances are you are a PC gamer, not a console gamer.