http://www.gameinformer.com/b/news/archive/2014/12/02/report-dead-island-2-beta-a-30-day-ps4-exclusive.aspx
Zombie game fans that decided to pre-order Escape Dead Island (read our review) received a code voucher slipped into their copy of the game. That code unlocks exclusive assess for Deep Silver and developer Jager's upcoming Dead Island 2 beta. The catch is, Sony users are getting it considerably earlier.
The beta's launch date hasn't yet been confirmed, but PlayStation 4 users can rest assured they'll be getting access 30 days before Xbox One and PC users. Deep Silver hasn't confirmed whether beta access will be opening up to a larger pool of players who didn't pre-order Escape Dead Island. Dead Island 2 releases next year.