As posted on Reddit, the gameplay shows some limited footage of a campaign mission in which the player must shoot terrorists (while avoiding citizens) and find the Aquilus CEO, whoever that may be.
The person who posted the leak, a Reddit poster by the name of ForeverDexus, claims to have found the footage online in an "incredibly obscure" place, along with further footage of the Black Ops 4 engine in pre-alpha and another video of the cancelled campaign.
Source
The person who posted the leak, a Reddit poster by the name of ForeverDexus, claims to have found the footage online in an "incredibly obscure" place, along with further footage of the Black Ops 4 engine in pre-alpha and another video of the cancelled campaign.
Source