Hit the link for the Tweets:
The question has been raised on Twitter as to whether we will ever see backwards compatibility for Xbox 360 games added to Windows 10, and the answer might surprise you. Rather than shut things down with a definitive 'no,' Xbox head Phil Spencer left the door ever-so-slightly ajar by responding, "Never say never."
That doesn't mean anything is imminent. Spencer also noted that compared to the Xbox One, which is backwards compatible with more than 300 Xbox 360 games, it would be "a lot more work" building an Xbox 360 emulator in Windows 10 that runs reliably across many different PC hardware configurations.
Here is the exchange for full context:
http://www.pcgamer.com/phil-spencer-leaves-door-open-for-xbox-360-emulation-on-windows-10/
The PS5 Exists.