Yesterday, Polygon reported that Call of Duty: Black Ops 4 does not have a traditional singleplayer story mode.

According to that site's sources, it is because it became clear to this year’s CoD developer Treyarch that the single-player campaign wouldn’t be completed in time.

A source for CoD news site Charlie Intel corroborated the story, but claimed that Activision cancelled the campaign because it was “too outlandish”.

Kotaku and Eurogamer sources also said that the campaign had been dropped, so I think it’s safe to assume the rumours are true.

Notably, the Xbox 360 and PlayStation 3 versions of Black Ops III shipped without the game’s campaign.

According to Venturebeat, DICE is ecstatic about CoD’s lack of a campaign, and thinks the move is a sign of weakness from Activision.

All sites report that Treyarch will focus on expanding the game’s competitive multiplayer and Zombies modes to compensate, and that additional co-op modes may also appear.

It is also heavily rumoured that a battle royale mode will ship in the game.

Eurogamer's sources claim that CoD's Battle Royale mode may not include 100 players like PUBG and Fortnite.

Charlie Intel sources claim that Raven Software – which often pitches in on the CoD franchise – is tackling the battle royale mode.

Activision will reveal its plans for Black Ops 4 on May 18 NZT.

The game has been given a release date of October 12 on Xbox One, PlayStation 4, and PC.

Call of Duty usually releases in November, but it seems likely Activision is hoping to get a head start on Rockstar's Red Dead Redemption 2, which comes out on October 26.

Last month, it was all but officially confirmed that Call of Duty: Modern Warfare 2 Remastered is in development, but that multiplayer won’t be included.

This morning, Venturebeat reported that DICE is testing a battle royale mode for Battlefield.