It appears that Final Fantasy XIII is headed to Xbox One according to a leaked image of the game that was spotted on Xbox.com by Xbox Achievements, but it’s most likely for an upcoming cloud-based streaming version by Ubitus in China.
You can see more evidence of the leaked image here. Since Square Enix has yet to make an official announcement for Final Fantasy XIII on Xbox One we can’t say exactly what it is, but it’s more than likely a version for the cloud-based Xbox stream service by Ubitus, which was announced last year. [Thanks, @Sora96.]
In any case, we’ll likely hear more from Square Enix sometime in the near future.