I know this because I read an article just today about Sony Online Entertainment, the company who developed and owned the rights to H1Z1, among other titles.
Basically, the news is that SOE have split from Sony. They were purchased by an investment firm called Columbus Nova, and renamed as Daybreak Game Company.
And the good news is that their strategy is to publish for multiple-platforms and consoles, rather than focusing on Sony-owned Playstation.
This means that the following titles will soon be available for Xbox: