The movie is called "the blip", and it takes place on Earth in the Marvel universe somewhere between 2018 (when Thanos kills half the universe) and 2023 (when the Avengers bring back half the universe). However the movie will not include any superheroes but instead will be about regular people trying to cope with Thanos killing all of their loved ones.
Basically it's a drama that's darker and more depressing than all of the other Marvel movies, and despite it containing zero fighting scenes it's still considered a Marvel movie (not a superhero movie though).