When does Untitled Keiko docuseries return?

Keiko was captured near Reyðarfjörður, Iceland in 1979 at the age of two. He was sold to Reino Aventura, an amusement park in Mexico City, Mexico, in 1985. At the time he was only 10 feet (3.0 m) long, he was housed with bottlenose dolphins, but no others of his own species. Keiko appeared in the 1993 film Free Willy. Warner Brothers and Craig McCaw approached the International Marine Mammal Project to return him to the wild.