Subnautica will release on Xbox One some time around mid 2016. That is our best guess right now. We can’t be 100% sure about the exact date right now. To find out when we have an exact date, follow @SubnauticaXbox on Twitter and Subnautica Xbox on Facebook.
— Subnautica Xbox One (@SubnauticaXbox) April 21, 2016
Both these pages will announce a release date as soon as we have it!