If this is true, this could be a big announcement- almost as big as their announcement of backwards compatibility last year.
Microsoft may be continuing on with their unification of Xbox and Windows to make one consolidated gaming ecosystem- if this rumor is true, it sounds like your Xbox 360 and Xbox One games may be playable on PCs with Windows 10 very soon.
They appear in the Works On This Device section on the Library page on the Windows Store.”
Apparently, the games are currently showing up in their account with “all DLCs and everything” that they bought on the Xbox Store.