Dead Island 2 multiplayer How does co-op work & is it crossplay

The Dead Island 2 multiplayer details have been revealed. Here is how co-op works and whether it is cross-play or not. Plus, how many players can connect?

Dead Island 2 DOWNGRADING to only 3 player co op compared to 4 from the previous game despite having 6 characters? Thoughts? : r/deadisland

How to invite and join friends in Co-op in Dead Island 2

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Dead Island 2 multiplayer: How to play co-op and what progress carries over?

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Dead Island 2 Co-Op Impressions

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Dead Island 2 co-op multiplayer - how to unlock the mode