The film was first announced in April 2018, when Kevin Feige confirmed The Eternals was in the early stages of development. In the months that followed, Matthew and Ryan Firpo were revealed to be attached as writers, with Chloe Zhao as director, though no word of what the film would be about or which characters would be adapted. That changed with a recent listing from Production Weekly, though, which confirmed the official start date.
The listing reveals a general outline of the film itself -- not to be taken as an official synopsis -- which reads, "the story of The Eternals is set millions of years ago when the cosmic beings known as the Celestials genetically experimented on humans, creating the super-powered individuals as well as more villainous off-shoots known as the Deviants. The two groups went on to battle each other throughout history to see which would eventually become the ultimate race. The story involves the love story between Ikaris, a man fueled by cosmic energy, and Sersi, who relishes in moving amongst humans."
The Eternals were created by artist and writer Jack Kirby and first appeared in The Eternals comic series in 1976, though they were certainly never as popular as other superheroes owned by Marvel Comics. While theirs may seem like a wild concept, different elements of The Eternals, such as the concept of Celestials, have already been introduced in the Marvel Cinematic Universe.
The Eternals is expected to be released in theaters in 2020.