A job listing for a "narrative scripter" on Infinity Ward's official webpage indicates the next Call of Duty game might have a campaign. If that's the case, the new title won't chuck its narrative in the same manner as Call of Duty: Black Ops 4.
The contract job description calls for someone with "a cinematic ear for dialogue pacing," "A strong desire to bring life to game characters through naturalistic and cinematic implementation of vocal performance," and "A strong interest and passion for First Person Shooter (FPS) games." The description also makes mention of working with directors and voice actors to "implement voice-over performances in-game across a wide variety of player experiences—from combat to set-pieces."
Activision hasn't unveiled anything about Call of Duty 2019 yet. But given Infinity Ward's deep involvement with the military shooter series and the nature of the job listing, it's (probably) safe to assume the next Call of Duty will have a story-based campaign. Call of Duty: Black Ops 4 is nixing a traditional campaign in favor of story elements woven into the game's multiplayer modes (Zombies! Zombies! Zombies!).
We'll report whatever news Activision dishes out about Call of Duty 2019, of course. In the meantime, our guide to Call of Duty: Black Ops 4 tells you everything you need to know about its upcoming October release.