Dead Island 2's upcoming beta will be exclusive to PlayStation 4 for 30 days.
The news was confirmed by Deep Silver, which also said that after the 30 days have passed, access will then be open to qualifying Xbox One and PC players.
You'll need to purchase the Xbox 360/PS3/PC spin-off Escape Dead Island to guarantee access, although we suspect that there will be other ways too.
Dead Island 2 releases on PS4, Xbox One and PC in Spring 2015. Those purchasing on PS4 will gain access to exclusive content.