There's two possibilities: Dead Island 2 is a next-gen PS5/Series X exclusive, or Dambuster is working on another new game.
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Dead Island 2 Comparison Video Reveals How the Game Runs on PS5 and Xbox Series X/S
Dead Island Review
Dead Island 2 PC requirements : r/nvidia
Dead Island 2 may skip current-gen as PS5, Series X, and PC exclusive
PS5 and Xbox Series X dev kits spectacular says one developer
Dead Island 2 – PS5 Games
Dead Island 2 - DF Tech Review - PS5 vs Xbox Series X/S vs ALL Last-Gen Consoles : r/PS5
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Dead Island 2 release date moved forward: Best pre-order deals on PS5 and more
Dead Island 2 - DF Tech Review - PS5 vs Xbox Series X/S vs ALL Last-Gen Consoles : r/PS5
How long is Dead Island 2 to beat?