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We spoke to designer Pete Bottomley about the game's absence on Xbox One, who replied that, "There's not really much to say. Sony contacted us first and were really excited about getting Ether One onto the platform.
"It feels like a good partnership and the whole PlayStation team has been great to work with. No one from XBOX has contacted us and none of the team are XBOX players so it wasn't really a consideration."
http://gamingbolt.com/dev-explains-why-ether-one-is-not-coming-on-xbox-one-none-of-the-team-are-xbox-players