https://www.gamespot.com/articles/e3-2018-why-xbox-one-is-getting-this-new-survival-/1100-6459796/

The PlayStation 4 does not have any kind of early access system, and this appears to be a pain point for some developers. Back in 2016, Ark developer Studio Wildcard said the lack of an early access-style system on PlayStation 4 was part of the reason why PlayStation gamers had to wait longer to play the title. And now, another developer has spoken out to say the lack of such a program on PS4 was at least a part of the conversation for why it chose to partner with Xbox instead.

The survival game Vigor, the new title from Arma studio Bohemia Interactive announced at E3 this week, is launching on Xbox One's Game Preview program this summer before a full launch in February 2019. Creative director Lukas Haladik told GameSpot that it was "obvious" for Bohemia to partner up with Microsoft.