Just seen this on YouTube. Some guy is showing DayZ running on Xbox One, but I'm not sure how legit this is. Looks to be running a bit too smooth IMO. Still though, Microsoft announced back at E3 2014 DayZ would be heading to Xbox One so it could be that the Game Preview version is launching (very) soon.
https://www.youtube.com/watch?v=y2iwj5QKyI4
https://www.youtube.com/watch?v=y2iwj5QKyI4