It looks like Sunset Overdrive has 8-player co-op

Sunset Overdrive appears to have co-op play for up to eight people, according to a since-pulled listing on the Xbox One…

Sunset Overdrive on Steam

Sunset Overdrive - Xbox One 885370848885

Sunset Overdrive on Steam

An Open World with No Rules: Leap off buildings, run along walls, and grind power lines and rails to destroy your foes from every angle. Lethal

Sunset Overdrive Day One Edition - Xbox One

Game Review: 'Sunset Overdrive' a feast of chaotic, neon action

Sunset Overdrive (Xbox One) *BRAND NEW - FACTORY SEALED* 885370848885

It looks like Sunset Overdrive has 8-player co-op

Sunset Overdrive Review - Metro Weekly

An Open World with No Rules: Leap off buildings, run along walls, and grind power lines and rails to destroy your foes from every angle. Lethal

Sunset Overdrive Day One Edition - Xbox One

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Sunset Overdrive, PC Steam Game

Sunset Overdrive Shown Off, Shows 8 Player Coop Among Other Mind Boggling Features

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It looks like Sunset Overdrive has 8-player co-op