Things have been looking grim in the DC Universe for some time now thanks to the machinations of Doctor Manhattan. From his killing the original Green Lantern in the past to removing the original Wally West from reality, Manhattan has meddled in the lives of the heroes and villains of the DC Universe for some time now, and it looks as though that may be coming to a head soon, as indicated by the cover of Doomsday Clock #9.
Shared on colorist Brad Anderson's Twitter, the cover shows Manhattan standing in front of the empty costumes of several Justice League members, as well as others like Red Robin and the Phantom Stranger. Doctor Manhattan holds his arm out towards the heroes, indicating that he has killed them.
While the full story behind the cover has yet to be revealed, it isn't shaping up to be a happy one. Bearing in mind all that Manhattan has done to the DC Universe during his brief stay, this may tie into whatever Manhattan has planned for the universe, or foreshadow a scene from later on in the issue.
Doomsday Clock #9 is slated to be released in January 2019.