I don't know who at Microsoft did this, but they're about to unleash a s*** storm of legal action. Nintendo Life reports that an NES emulator, NESBox, has been green-lit for the Xbox-One. The emulator will run as a homebrew that allows you to run NES roms via USB. 

I can guarantee this won't actually make it to Xbox One, but you have to wonder how it managed to slip through unnoticed!