Halo 5's 4-Player Co-Op Allows for a Much More Sociable Story - GameSpot

Microsoft explains why it's focusing so heavily on four-player co-op with the upcoming game.
A new entry in the Halo franchise was announced at the Microsoft Press Conference at E3 2013 for the Xbox One.

Halo 5: Guardians' review: A solid, blockbuster experience - The Washington Post

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Halo 5's 4-Player Co-Op Allows for a Much More Sociable Story - GameSpot

Assembling A Cathedral Out Of A Hurricane — The Making of Halo 2, by Andrew G.

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Halo 5: Guardians features exciting 4-player co-op and new enemies

Why Halo 5 Doesn't Have Split-Screen

Halo 5: Guardians – Xbox One : Microsoft Corporation

Halo 5: Guardians Gets New Info About Campaign, Co-op, and Fireteams - GameSpot

Halo 5 Dev Confirms Character Models Are All In-Engine, No Split-Screen Due To 60 FPS

Halo 3 - Wikipedia