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?

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Dead Island 2

Is Dead Island 2 playable in split-screen?

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Dead Island 2 story “around 20 hours,” fleshed out with extra

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PC Specs, Download Size, Crossplay And More For Dead Island 2

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Dead Island 2 Co-Op Mode Explained, Cross-Gen Only and No Hosting

Is Dead Island 2 crossplay on PlayStation, Xbox, and PC?