N64 emulator in publishing status.
(Edit) OP, also NESbox is not just an NES emulator, it's a NES, SNES, Genesis, and Gameboy/Advance emulator.
Spotted by LuvOfThaGame
With devs now able to publish Window applications directly onto the Xbox One it was only a matter of time before this happened. As it stands right now there are emulators on the Windows store but it remains to be seen if MS will allow those applications to exist on Xbox.