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?

Is Dead Island 2 going to offer cross platform support

Dead Island 2 MULTIPLAYER TUTORIAL

Dead Island 2 Players on Base Xbox One Won't Be Able to Host Co-op

Co-Optimus - Review - Dead Island 2 Co-op Review

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

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

Dead Island 2 multiplayer co-op: How to play with friends

Great Games with Long Co-Op Campaigns

How to play Dead Island 2 co-op multiplayer

Does Dead Island 2 have co-op multiplayer? - Dexerto

Does Dead Island 2 have crossplay?

Dead Island 2: How To Play Co-op