Guns of Icarus Alliance will allow cross-play between 4 platforms

Guns of Icarus Alliance
Release Date: Mar 31, 2017
Official Website: Link
Crossplay platforms:
Guns of Icarus Alliance will support cross-play across multiple platforms. It will be possible to play together with your friends on Windows PC, Playstation 4, Linux and Mac. Please check out all the details on the game's official website!
Summary:
Guns of Icarus Alliance is the complete PvE experience while maintaining all the PvP contents, including achievements, progression, cosmetics, and data from Guns of Icarus Online. From a single pilot to as many as 16 players can unite in their battle for the wasteland, completing objectives in all new PvE/Co-op game modes like capturing cargo or destroying drilling platforms. You just need to grab your friends and go. Choose a faction and unlock their special costumes, weapons, and airships as each victory brings your faction one step closer to their ultimate goal of reshaping the world.

Screenshots:
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Supported game modes:
  • Multiplayer
  • Co-operative
Supported player perspectives:
  • First person
  • Third person