The dystopia series with the previous 3 seasons available on Netflix is back soon.
The official date has not been announced but it should be available by late 2017 or early next year.
We know so far there are at least 6 episodes.
Check out the following article to read more about the upcoming Season 4 for “Black mirror”: http://www.nme.com/blogs/black-mirror-season-4-episodes-trailers-cast-authors-2157079
Black Mirror Season 4 – Netflix episodes, cast, release date, teaser