A teaser at the end of The Dark Pictures Anthology: Man of Medan shows what to expect with the next entry.
The next entry in the The Dark Pictures Anthology, Little Hope, has been teased ahead of its early 2020 release.
The teaser video is shown in Man of Medan when the player unlocks a particular ending.
As you can see, the teaser is rather short (thanks, AGD).
The Dark Pictures Anthology will be released as a series, with Supermassive planing to drop a new entry every six months or so. Each will be a standalone title, without any connection to the previous game.